You searched for subject:(Sodium alginate).
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Duquesne University
1.
Fu, Shao.
Inter-Grade and Inter-Batch Variability of Pharmaceutical-Grade Sodium Alginate.
Degree: PhD, Pharmaceutics, 2011, Duquesne University
URL: https://dsc.duq.edu/etd/557 
► Polymeric excipients are generally the least well-characterized components of pharmaceutical formulations. The aim of this dissertation work is to facilitate the quality-by-design (QbD) approach to…
(more)
▼ Polymeric excipients are generally the least well-characterized components of pharmaceutical formulations. The aim of this dissertation work is to facilitate the quality-by-design (QbD) approach to pharmaceutical formulation and manufacturing by evaluating the inter-grade and inter-batch variability of pharmaceutical-grade polymeric excipients.
Sodium alginate, a widely used polymeric excipient, was selected for evaluation using appropriate analytical methods and test conditions, especially rheological methods. The materials used were six different grades of
sodium alginate and an additional ten batches of one of the grades.
To compare the six grades, steady shear measurements were conducted on solutions at 1, 2, and 3% w/w, consistent with their use as thickening or binding agents. Small amplitude oscillation (SAO) measurements were conducted on
sodium alginate solutions at higher concentrations (4-13% w/w) corresponding to their use in controlled release matrices. In order to compare the ten batches of one grade, steady shear and SAO measurements were performed on their solutions at 2% w/w and 8% w/w, respectively. Results show that rheological properties of
sodium alginate solutions are influenced by both molecular weight and chemical composition of
sodium alginate. ¡§One-point¡¨ apparent viscosity data obtained at one low concentration and one shear rate is not representative of the complex rheological behavior of various grades of
sodium alginate solutions at higher concentrations or other shear rates. The potential interchangeability of these different grades used as thickening or binding agents could be established by comparing the apparent viscosities of their solutions as a function of both
alginate concentration and shear conditions. For
sodium alginate used in controlled release formulations, both steady shear (at one low concentration, e.g., 2% w/w) and SAO measurements (at one high concentration indicative of polymer gel state, e.g., 8% w/w) are recommended to be performed on
sodium alginate solutions to ensure interchangeability. Furthermore, among batches of the same grade, significant differences in rheological properties were observed, especially at the high solution concentration (i.e., 8% w/w). In summary, inter-grade and inter-batch variability of
sodium alginate can be determined using steady shear and SAO methods.
The influence of inter-grade and inter-batch variability of
sodium alginate on the functionality of
sodium alginate used in matrix tablets was investigated with a focus on compression properties, swelling, erosion behavior of
alginate matrix tablets, and drug release from matrix tablets. The compression behavior of four grades and three batches of
sodium alginate were studied by compaction energetics, out-of-die Gurnham, and out-of-die Heckel analysis. It was found that
sodium alginates deform less plastically than microcrystalline cellulose (MCC PH102) but similar to lactose anhydrous.
Sodium alginates also demonstrate more elastic deformations during compression than…
Advisors/Committee Members: Lawrence H. Block, Peter Wildfong, Ira Buckner, Brian Carlin, Sachin Velankar, Christianah Moji Adeyeye.
Subjects/Keywords: Calcium alginate gels; Controlled release matrix; Rheology; Sodium alginate; Viscoelasticity; Viscosity
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APA (6th Edition):
Fu, S. (2011). Inter-Grade and Inter-Batch Variability of Pharmaceutical-Grade Sodium Alginate. (Doctoral Dissertation). Duquesne University. Retrieved from https://dsc.duq.edu/etd/557
Chicago Manual of Style (16th Edition):
Fu, Shao. “Inter-Grade and Inter-Batch Variability of Pharmaceutical-Grade Sodium Alginate.” 2011. Doctoral Dissertation, Duquesne University. Accessed February 28, 2021.
https://dsc.duq.edu/etd/557.
MLA Handbook (7th Edition):
Fu, Shao. “Inter-Grade and Inter-Batch Variability of Pharmaceutical-Grade Sodium Alginate.” 2011. Web. 28 Feb 2021.
Vancouver:
Fu S. Inter-Grade and Inter-Batch Variability of Pharmaceutical-Grade Sodium Alginate. [Internet] [Doctoral dissertation]. Duquesne University; 2011. [cited 2021 Feb 28].
Available from: https://dsc.duq.edu/etd/557.
Council of Science Editors:
Fu S. Inter-Grade and Inter-Batch Variability of Pharmaceutical-Grade Sodium Alginate. [Doctoral Dissertation]. Duquesne University; 2011. Available from: https://dsc.duq.edu/etd/557
2.
Her, Chithdavone.
Formulation d’un gel muco-adhésif contenant des nanocapsules lipidiques de curcumine en vue d’une administration par voie orale : Entrapment of Curcumin loaded lipid nanocapsules into muco-adhesive gel for oral administration.
Degree: Docteur es, Pharmacie, 2018, Angers
URL: http://www.theses.fr/2018ANGE0061
► Ces travaux de thèse ont porté sur la formulation de gels muco-adhésifs piégeant des nanocapsules lipidiques (LNCs) de curcumine. L’objectif est d’améliorer la biodisponibilité de…
(more)
▼ Ces travaux de thèse ont porté sur la formulation de gels muco-adhésifs piégeant des nanocapsules lipidiques (LNCs) de curcumine. L’objectif est d’améliorer la biodisponibilité de la curcumine en la solubilisant au sein des LNCs piégées dans un gel, utilisées pour augmenter l’absorption intestinale. La première étape du travail a permis d’identifier le Transcutol®HP et le Kolliphor®HS15 comme excipients compatibles avec la préparation des LNCs tout en assurant une solubilisation suffisante de la curcumine. Deux formulations de LNCs de curcumine ont été proposées : l’une avec le Transcutol®HP/Labrafac®WL1349/Labrafil® M1944CS et l’autre avec le Captex®8000 en tant que constituants du cœur des particules. La formulation avec le Transcutol®HP a été optimisée pour obtenir des particules de 63nm avec une distribution étroite (PdI=0.17) et un rendement d’encapsulation de 92%. Avec le Captex®8000 des particules de 57nm avec un PdI<0.1 ont été obtenues. En revanche, pour les deux formulations, l’étape de purification constitue une étape critique non résolue. Un gel d’alginate de sodium, de géométrie cylindrique compatible avec une insertion dans des gélules, a également été développé. La capacité des gels à absorber l’eau dans différents milieux biomimétiques a été suivie dans le temps in vitro. Une différence de comportement entre les gels lyophilisés et les gels non lyophilisés a été mise en évidence. Enfin, l’encapsulation de deux fluorochromes dans les LNCs a permis de suivre l’intégrité des LNCs lors de la formulation des gels par la technique de transfert d'énergie par résonance de type Förster (FRET). Les LNCs restent intactes pendant l’étape de gélification et la capacité du gel à piéger les LNCs a été démontrée.
The aim of this phD work was to develop a muco-adhesive gel entrapping curcumin loaded lipid nanocapsules (LNCs). The objective was to improve the bioavailability of curcumin by its solubilization into LNCs entrapped into a gel to increase intestinal absorption. Firstly, [email protected] and [email protected] HS15 were identified as suitable excipients to formulate LNCs With a sufficient solubility of curcumin. Two formulations of curcumin LNCs were M1944CS or [email protected], which form the core of particles. The TranscutoPHP formulation was optimized to obtain 63nm particles With a narrow distribution (Pdl=0.17) and 920/0 of encapsulation efficiency. Particles With a mean diameter of 57nm and Pdl<O.1 were obtained With [email protected] Nevertheless, for both formulations, purification is still a critical step to solve. A cylindrical sodium alginate gel, suitable for capsule insertion, was developed. The swelling behavior of gels has been studied in vitro in biomimetic media. A difference was revealed between freeze-dried and native gels. Finally, two dyes were encapsulated into LNCS to follow the preservation of particle integrity by Förster Resonance Energy Transfer (FRET) during gel formulation process. LNCs remained intact during the gelation step and gel ability to entrap LNCs was shown.
Advisors/Committee Members: Venier-Julienne, Marie-Claire (thesis director), Roger, Émilie (thesis director).
Subjects/Keywords: Curcumine; Nanocapsules lipidiques; Gel muco-Adhésif; Alginate de sodium; Curcumine; Lipid nanocapsules; Muco-adhesive gel; Sodium alginate; 615
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APA (6th Edition):
Her, C. (2018). Formulation d’un gel muco-adhésif contenant des nanocapsules lipidiques de curcumine en vue d’une administration par voie orale : Entrapment of Curcumin loaded lipid nanocapsules into muco-adhesive gel for oral administration. (Doctoral Dissertation). Angers. Retrieved from http://www.theses.fr/2018ANGE0061
Chicago Manual of Style (16th Edition):
Her, Chithdavone. “Formulation d’un gel muco-adhésif contenant des nanocapsules lipidiques de curcumine en vue d’une administration par voie orale : Entrapment of Curcumin loaded lipid nanocapsules into muco-adhesive gel for oral administration.” 2018. Doctoral Dissertation, Angers. Accessed February 28, 2021.
http://www.theses.fr/2018ANGE0061.
MLA Handbook (7th Edition):
Her, Chithdavone. “Formulation d’un gel muco-adhésif contenant des nanocapsules lipidiques de curcumine en vue d’une administration par voie orale : Entrapment of Curcumin loaded lipid nanocapsules into muco-adhesive gel for oral administration.” 2018. Web. 28 Feb 2021.
Vancouver:
Her C. Formulation d’un gel muco-adhésif contenant des nanocapsules lipidiques de curcumine en vue d’une administration par voie orale : Entrapment of Curcumin loaded lipid nanocapsules into muco-adhesive gel for oral administration. [Internet] [Doctoral dissertation]. Angers; 2018. [cited 2021 Feb 28].
Available from: http://www.theses.fr/2018ANGE0061.
Council of Science Editors:
Her C. Formulation d’un gel muco-adhésif contenant des nanocapsules lipidiques de curcumine en vue d’une administration par voie orale : Entrapment of Curcumin loaded lipid nanocapsules into muco-adhesive gel for oral administration. [Doctoral Dissertation]. Angers; 2018. Available from: http://www.theses.fr/2018ANGE0061
Anna University
3.
Kanth, Swarna V.
Studies on biodegradable tanning system based on
polyfunctional aldehydes.
Degree: 2013, Anna University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/10096
► Tanning is the process of conversion of raw hides and skins into imputrescible leather; thereby the later acquires resistance to chemical, thermal and microbial forces.…
(more)
▼ Tanning is the process of conversion of raw hides
and skins into imputrescible leather; thereby the later acquires
resistance to chemical, thermal and microbial forces. Tanning,
specifically stabilization of collagen could be accomplished by
many substances. Three representative carbohydrate biopolymers such
as starch, cellulose and alginate were modified as dialdehydes and
used for the stabilization of collagen. The ability of the three
modified biopolymers i.e. dialdehyde starch (DAS), dialdehyde
cellulose (DAC) and dialdehyde sodium alginate (DSA) as
polyaldehydes in rendering leathers with matching physical
properties to that of the chrome tanned or vegetable tanned
leathers were assessed. The amenability of these leathers for
biodegradation was also verified. An attempt to understand the
molecular level mechanism of these polyaldehydes with stabilization
of collagen is presented. Thermodynamics with respect to
denaturation temperature, rate of shrinkage, activation energy and
enthalpy change were also found to be in the same order. A similar
trend was observed for enzymatic stability of collagen against
degradation of collagenase. Quaternary structural alterations
resulted in qualitative changes in banding density for DAS-Dimer
and DAS-Trimer. Changes in DPeriodicity were observed for DAS-Dimer
and DAS-Trimer treated collagen. A fibrous network was observed for
trimer. Polyaldehydes stabilized collagen substratum is
biocompatible and enhances cell proliferation. Tanned leathers from
DAS, DAC and DSA resulted in leather properties that are suitable
for upper and garment leathers. The biodegradability of
polyaldehyde tanned leathers was within international standards as
compared to conventional chrome and vegetable tanned leathers. The
biodegradability of polyaldehyde tanned leathers was found to be
better than chrome tanned and vegetable tanned leathers. The
present work investigates the molecular insights into the mechanism
of polyaldehyde tanning as an integrated biodegradable tanning
system.
References p. 153-164, List of publications p.
165
Advisors/Committee Members: Raghava Rao, J, Nair, Balachandran Unni.
Subjects/Keywords: Biodegradabale; Polyfunctional aldehydes; Dialdehyde starch; Dialdehyde cellulose; Dialdehyde sodium alginate
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APA (6th Edition):
Kanth, S. V. (2013). Studies on biodegradable tanning system based on
polyfunctional aldehydes. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/10096
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kanth, Swarna V. “Studies on biodegradable tanning system based on
polyfunctional aldehydes.” 2013. Thesis, Anna University. Accessed February 28, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/10096.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kanth, Swarna V. “Studies on biodegradable tanning system based on
polyfunctional aldehydes.” 2013. Web. 28 Feb 2021.
Vancouver:
Kanth SV. Studies on biodegradable tanning system based on
polyfunctional aldehydes. [Internet] [Thesis]. Anna University; 2013. [cited 2021 Feb 28].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/10096.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kanth SV. Studies on biodegradable tanning system based on
polyfunctional aldehydes. [Thesis]. Anna University; 2013. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/10096
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Iowa State University
4.
Ruther, Benjamin Lee.
Effects of processing method and non-meat binding ingredients on batter stability, yield and texture of frankfurters.
Degree: 2019, Iowa State University
URL: https://lib.dr.iastate.edu/etd/17773
► The effects of processing method and added non-meat ingredients on the processing yield, batter stability, and texture profile of frankfurters were investigated. Five ingredient treatments…
(more)
▼ The effects of processing method and added non-meat ingredients on the processing yield, batter stability, and texture profile of frankfurters were investigated. Five ingredient treatments (control, sodium alginate, iota carrageenan, transglutaminase, and pork collagen) of frankfurters were produced using three different processing methods (coarse grinding, chopping in a bowl chopper and passing through an emulsion mill). Emulsion stability (water separation, fat separation and total liquid separation) was measured on the resulting batter. Processing yield was measured after cooking and chilling the frankfurters. A texture profile analysis (TPA) of the finished frankfurters was also conducted with a focus on the TPA characteristics of hardness, cohesiveness, and chewiness. Control treatments produced by different methods showed significantly (P < 0.05) different levels of processing yield with the emulsion mill producing the highest, followed by bowl chopper and then coarse grinding. Coarse ground treatments showed the most negative impact of processing method on processing yield and texture characteristics. The addition of transglutaminase showed a positive effect on TPA characteristics chewiness and cohesiveness, and did not affect processing yield. Consequently, a difference between frankfurters produced with different methods was observed, and a means to offset those differences through ingredient formulation was demonstrated.
Subjects/Keywords: carrageenan; collagen; sodium alginate; transglutaminase; Agriculture; Animal Sciences; Food Science
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APA ·
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APA (6th Edition):
Ruther, B. L. (2019). Effects of processing method and non-meat binding ingredients on batter stability, yield and texture of frankfurters. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/17773
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ruther, Benjamin Lee. “Effects of processing method and non-meat binding ingredients on batter stability, yield and texture of frankfurters.” 2019. Thesis, Iowa State University. Accessed February 28, 2021.
https://lib.dr.iastate.edu/etd/17773.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ruther, Benjamin Lee. “Effects of processing method and non-meat binding ingredients on batter stability, yield and texture of frankfurters.” 2019. Web. 28 Feb 2021.
Vancouver:
Ruther BL. Effects of processing method and non-meat binding ingredients on batter stability, yield and texture of frankfurters. [Internet] [Thesis]. Iowa State University; 2019. [cited 2021 Feb 28].
Available from: https://lib.dr.iastate.edu/etd/17773.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ruther BL. Effects of processing method and non-meat binding ingredients on batter stability, yield and texture of frankfurters. [Thesis]. Iowa State University; 2019. Available from: https://lib.dr.iastate.edu/etd/17773
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
5.
Vasanth Bailey, Pavithra (author).
Developing Edible Barcodes from Hydrogels: A study on the influence of drying.
Degree: 2018, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:66c61f5d-e33d-4918-8c0f-6b311aebc833
► Counterfeiting of food and pharmaceutical products, albeit a more serious issue in developing countries is, however, omnipresent. Therefore, there is an ever-growing need for anticounterfeiting…
(more)
▼ Counterfeiting of food and pharmaceutical products, albeit a more serious issue in developing countries is, however, omnipresent. Therefore, there is an ever-growing need for anticounterfeiting measures to address this challenge. Currently, the existing overt and covert anticounterfeiting measures are more prevalent on the packaging of such products. While such measures are helpful to a certain extent, they are however, easier to by-pass with re-used authentic packaging, fake barcodes and duplicate product numbering. Furthermore, advanced research and new innovations have indicated that it is also possible to have additional levels of security by incorporating similar measures into or on the product itself. Although these novel anticounterfeiting measures offer a unique opportunity to safeguard the customer’s interest at best, they present certain challenges. Some of these include bio-compatibility of the materials and the need for them to be in compliance with regulatory organizations. However, overcoming these challenges confronts the issue directly. In this work, the approach is to develop a proof of concept of entirely edible barcodes from naturally available and/or food grade materials such as sodium alginate. This study also focusses on the influence of drying on the macroscopic structure of such barcodes. The bar-codes are produced by physically cross-linking the polymer in specific moulds, converting them into a hydrogel barcode in itself. Altogether, this work provides a qualitative under-standing that such a concept can be developed and that the significant structural changes upon drying is not exclusively governed by the concentration of sodium alginate.
Chemical Engineering
Advisors/Committee Members: Eral, Burak (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: Anticounterfeiting; hydrogel; edible barcode; sodium alginate; drying; thermogravimetric analysis
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APA (6th Edition):
Vasanth Bailey, P. (. (2018). Developing Edible Barcodes from Hydrogels: A study on the influence of drying. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:66c61f5d-e33d-4918-8c0f-6b311aebc833
Chicago Manual of Style (16th Edition):
Vasanth Bailey, Pavithra (author). “Developing Edible Barcodes from Hydrogels: A study on the influence of drying.” 2018. Masters Thesis, Delft University of Technology. Accessed February 28, 2021.
http://resolver.tudelft.nl/uuid:66c61f5d-e33d-4918-8c0f-6b311aebc833.
MLA Handbook (7th Edition):
Vasanth Bailey, Pavithra (author). “Developing Edible Barcodes from Hydrogels: A study on the influence of drying.” 2018. Web. 28 Feb 2021.
Vancouver:
Vasanth Bailey P(. Developing Edible Barcodes from Hydrogels: A study on the influence of drying. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Feb 28].
Available from: http://resolver.tudelft.nl/uuid:66c61f5d-e33d-4918-8c0f-6b311aebc833.
Council of Science Editors:
Vasanth Bailey P(. Developing Edible Barcodes from Hydrogels: A study on the influence of drying. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:66c61f5d-e33d-4918-8c0f-6b311aebc833
6.
Yesmin, Most Farzana.
Biodegradable Biomaterials as Suitable Alternatives to Water Treatment Technologies.
Degree: MS, Dairy Science, 2020, South Dakota State University
URL: https://openprairie.sdstate.edu/etd/4077
► Nitrates and phosphates are essential nutrients for plants growth. Their excess presence in water, however, could cause eutrophication affecting the water quality and altering…
(more)
▼ Nitrates and phosphates are essential nutrients for plants growth. Their excess presence in water, however, could cause eutrophication affecting the water quality and altering the aquatic ecosystem. Algal blooms and the presence of toxins such as microcystin in freshwater bodies are hazardous to humans, animals, and wildlife. Conventional technologies such as ion exchange, distillation, reverse osmosis, and bioreactors aid immensely to remove nutrients; however, they are expensive. Furthermore, building new nitrate and phosphate treatment units, maintenance and post-disposal are costly too. In this regard, there exists an unmet need for alternative processes that are renewable and cost-effective to treat contaminated water. Herein, a novel opportunity based on inexpensive and widespread polysaccharides, e.g.
alginate, has been developed to capture nitrate and phosphate from water and improving water quality.
Alginate beads have been prepared in the presence of divalent (Ca
2+, Fe
2+, Ni
2+, Cu
2+, Zn
2+, and Sr
2+) and trivalent (Al
3+ and Fe
3+) cations. The maximum absorption capacity of nitrate and phosphate by the
alginate beads has been established using 5, 10, 25 mg/L of nitrate and 1, 5, 10, 15, and 20 mg/L of phosphate solutions. Results suggest that
alginate beads are effective to capture nitrate and phosphate from solutions and the type of ionic crosslink ions has a significant influence on the total absorbed amount. A maximum (94.0 ±0.1)% of phosphate could be removed using the Al
3+-
alginate beads and (33.6±1.9)% of nitrates by the Fe3+-
alginate beads. Further characterization of beads by FTIR and DSC reveal the influence of ions on the nitrate and phosphate absorption capacity by the
alginate beads. Overall, this study successfully establishes the potential of polysaccharide beads to capture nutrients and improve water quality and opens a new window of opportunities to water treatment technologies.
Advisors/Committee Members: Srinivas Janaswamy.
Subjects/Keywords: Beads; Biopolymers; Nitrates; Phosphates; Sodium alginate; Water purification; Food Science
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APA ·
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APA (6th Edition):
Yesmin, M. F. (2020). Biodegradable Biomaterials as Suitable Alternatives to Water Treatment Technologies. (Masters Thesis). South Dakota State University. Retrieved from https://openprairie.sdstate.edu/etd/4077
Chicago Manual of Style (16th Edition):
Yesmin, Most Farzana. “Biodegradable Biomaterials as Suitable Alternatives to Water Treatment Technologies.” 2020. Masters Thesis, South Dakota State University. Accessed February 28, 2021.
https://openprairie.sdstate.edu/etd/4077.
MLA Handbook (7th Edition):
Yesmin, Most Farzana. “Biodegradable Biomaterials as Suitable Alternatives to Water Treatment Technologies.” 2020. Web. 28 Feb 2021.
Vancouver:
Yesmin MF. Biodegradable Biomaterials as Suitable Alternatives to Water Treatment Technologies. [Internet] [Masters thesis]. South Dakota State University; 2020. [cited 2021 Feb 28].
Available from: https://openprairie.sdstate.edu/etd/4077.
Council of Science Editors:
Yesmin MF. Biodegradable Biomaterials as Suitable Alternatives to Water Treatment Technologies. [Masters Thesis]. South Dakota State University; 2020. Available from: https://openprairie.sdstate.edu/etd/4077
Delft University of Technology
7.
Vijay, Ashwin (author).
Improving Solid State Batteries Using Bio-derived Alginates.
Degree: 2019, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:7c637fef-1486-43c9-9c12-7433640376e3
► Advancements in energy storage technologies need to keep pace with the accelerating transition to renewable energy sources. Li metal anodes and high voltage cathode materials…
(more)
▼ Advancements in energy storage technologies need to keep pace with the accelerating transition to renewable energy sources. Li metal anodes and high voltage cathode materials are widely considered to be the path into next generation Li-ion batteries, while the scare amounts of lithium in the earth's crust has prompted research into other battery materials. Of these,
Sodium-ion batteries are extremely interesting due to the abundance of Na, similar insertion chemistry to Li as well as the possibility of using aqueous electrolytes due to higher redox potential. Next generation Li-ion batteries are currently held back due to issues like - dendrite formation at the metal anode which may lead to internal short circuiting and thermal runaway of the organic electrolyte. Similarly, Na-ion systems have issues with organic electrolytes due to the limited solubility of Na electrolyte salts. Solid state electrolytes (SSEs) have rapidly garnered interest as a potential alternative. SSEs vastly improve battery safety due to their superior thermal stability and mechanical strength. However, there are still limitations for SSEs in both these systems that need to be resolved prior to implementing these electrolytes in commercial batteries.In this study,
alginate salts, which are natural polysaccarides extracted from brown algae, have been examined as a solution to the problems in these systems. Initially,
sodium and lithium salts (NaAlg and LiAlg) of alginic acid were synthesized followed by their physical characterization. Conductivity for
sodium and lithium
alginate (with 0% water) were both promising at 0.2 mS/cm. Additionally, both LiAlg and NaAlg exhibit excellent performance as binders in anode systems compared to PVdF (polyvinylidene difluoride) binders.For utilizing the LiAlg in Li solid-state batteries, NaSICON-based LAGP electrolyte was synthesized and characterized for this study. The degradation of LAGP on Li contact has already been well researched. To combat the issue, we try to utilize a layer of LiAlg as protective layer at the LAGP surface. The coated LAGP remains stable against Li without undergoing degradation. The Li cyclability and electrochemical performance of LiAlg was further analysed by coating it on a various electrodes and studying their rate capabilities against Li. LiAlg displayed excellent performance as a secondary polymer electrolyte on the surface and in the bulk of the electrodes. These tests show exceptional cycling performances and establish a proof of concept for LiAlg as a polymer electrolyte.NaAlg which was chosen as the electrolyte in Na-ion batteries, displays better gelation properties. The effects of water content and operating temperature on Na conductivity were investigated. For a fixed water content, increasing the temperature results in improved conductivity - though this effect is more prominent at higher water concentrations and within the margin of error at lower water concentrations. At a fixed temperature, the conductivity shows linear improvement in at low (<25%) and high…
Advisors/Committee Members: Kelder, Erik (mentor), Picken, Stephen (graduation committee), Eijt, Stephan (graduation committee), Basak, Shibabrata (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: Alginates; Li-ion battery; solid state battery; battery electrolytes; Na-ion battery; Sodium Alginate; Lithium Alginate
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APA ·
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Export
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Manager
APA (6th Edition):
Vijay, A. (. (2019). Improving Solid State Batteries Using Bio-derived Alginates. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:7c637fef-1486-43c9-9c12-7433640376e3
Chicago Manual of Style (16th Edition):
Vijay, Ashwin (author). “Improving Solid State Batteries Using Bio-derived Alginates.” 2019. Masters Thesis, Delft University of Technology. Accessed February 28, 2021.
http://resolver.tudelft.nl/uuid:7c637fef-1486-43c9-9c12-7433640376e3.
MLA Handbook (7th Edition):
Vijay, Ashwin (author). “Improving Solid State Batteries Using Bio-derived Alginates.” 2019. Web. 28 Feb 2021.
Vancouver:
Vijay A(. Improving Solid State Batteries Using Bio-derived Alginates. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Feb 28].
Available from: http://resolver.tudelft.nl/uuid:7c637fef-1486-43c9-9c12-7433640376e3.
Council of Science Editors:
Vijay A(. Improving Solid State Batteries Using Bio-derived Alginates. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:7c637fef-1486-43c9-9c12-7433640376e3
Universidade do Rio Grande do Norte
8.
Lisboa, Marcia Severiano.
Obtenção e caracterização do sistema compósito alginato de sódio-dióxido de titânio em formas de pó e de membrana
.
Degree: 2011, Universidade do Rio Grande do Norte
URL: http://repositorio.ufrn.br/handle/123456789/17745
► The alginates are copolymers of 1→4-linked β-D-mannuronic acid (M) and α-Lguluronic acid (G) residues that are arranjed in a block structure along a linear chain.…
(more)
▼ The alginates are copolymers of 1→4-linked β-D-mannuronic acid (M) and α-Lguluronic
acid (G) residues that are arranjed in a block structure along a linear chain.
Titanium dioxide, TiO2, is a ceramic material and can exist in three distinct crystallography
forms: anatase, brookite and rutile. composites of organic and inorganic materials have better
properties than the components alone. Thus, this study aims to synthesize, characterize and
analyze the composite NaAlg-TiO2 in the form of powder and film. The synthesis of
composite powders was performed using the sol-gel process and obtain the composite film
was performed using the slow evaporation process, then the composites were analyzed by
infrared spectroscopy, fluorescence x ray, thermal analysis, attenuated total reflection (ATR),
x ray diffraction and impedance spectroscopy. The X ray diffraction patterns of composite
powders show that with increasing calcination temperature, there were no complete transition
of rutile-anatase crystalline phase, since at all temperatures studied (300, 500, 700, 900 and
1100ºC) were observed peaks of anatase phase. Thermal analysis shows that at 400°C caused
the decomposition of
sodium alginate in
sodium carbonate and above 600°C, we observe an
exothermic peak related to the decomposition of
sodium carbonate and in the presence of
titanium dioxide becomes
sodium titanate. The XRD results confirm the formation of
sodium
carbonate at 700ºC and the formation
sodium titanate in the temperature range 900-1100ºC.
The
sodium titanate influenced the electrical properties of the material, because with
increasing temperature there was a decrease in conductivity, probably due to the creation of Ti
vacancies, since the
sodium can induce the reduction of surface Ti4+ ions into Ti3+ species.
The infrared spectra of the composites in the form of powder and film showed a small shift in
the bands compared to the spectrum of pure
alginate, indicating that these shifts, even small
ones, have evidence of miscibility between the polymer and ceramic material
Advisors/Committee Members: Cavalcante, Maria Gorette (advisor), CPF:10843329491 (advisor), http://lattes.cnpq.br/2069510469317474 (advisor).
Subjects/Keywords: Dióxido de titânio;
Alginato de sódio;
Compósitos;
Titanium dioxide;
Sodium alginate;
Composites
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Lisboa, M. S. (2011). Obtenção e caracterização do sistema compósito alginato de sódio-dióxido de titânio em formas de pó e de membrana
. (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/17745
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lisboa, Marcia Severiano. “Obtenção e caracterização do sistema compósito alginato de sódio-dióxido de titânio em formas de pó e de membrana
.” 2011. Thesis, Universidade do Rio Grande do Norte. Accessed February 28, 2021.
http://repositorio.ufrn.br/handle/123456789/17745.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lisboa, Marcia Severiano. “Obtenção e caracterização do sistema compósito alginato de sódio-dióxido de titânio em formas de pó e de membrana
.” 2011. Web. 28 Feb 2021.
Vancouver:
Lisboa MS. Obtenção e caracterização do sistema compósito alginato de sódio-dióxido de titânio em formas de pó e de membrana
. [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2011. [cited 2021 Feb 28].
Available from: http://repositorio.ufrn.br/handle/123456789/17745.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lisboa MS. Obtenção e caracterização do sistema compósito alginato de sódio-dióxido de titânio em formas de pó e de membrana
. [Thesis]. Universidade do Rio Grande do Norte; 2011. Available from: http://repositorio.ufrn.br/handle/123456789/17745
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
9.
Marcia Severiano Lisboa.
Obtenção e caracterização do sistema compósito alginato de sódio-dióxido de titânio em formas de pó e de membrana.
Degree: 2011, Universidade Federal do Rio Grande do Norte
URL: http://bdtd.bczm.ufrn.br/tedesimplificado//tde_busca/arquivo.php?codArquivo=4937
► O alginato de sódio, NaAlg, é um polissacarídeo formado por ligações do tipo 1-4 entre os ácidos β-D-manurônico e α-L-gulurônico arranjados em bloco ao longo…
(more)
▼ O alginato de sódio, NaAlg, é um polissacarídeo formado por ligações do tipo 1-4 entre os ácidos β-D-manurônico e α-L-gulurônico arranjados em bloco ao longo de uma cadeia linear. O dióxido de titânio, TiO2, é um material cerâmico e existe em três formas cristalinas: anatásio, bruquita e rutilo. Os compósitos de materiais orgânicos e inorgânicos apresentam melhores propriedades do que os componentes isoladamente. Dessa forma, o presente trabalho teve objetivo sintetizar, caracterizar e analisar os compósitos, NaAlg-TiO2, em formas de pó e de membrana. A síntese dos pós compósitos foi realizada através do processo sol-gel e a obtenção dos compósitos em forma de membrana foi realizada através do processo de evaporação lenta. Em seguida, os compósitos foram caracterizados por espectroscopia de infravermelho, difratometria de raios X, espectroscopia de impedância, fluorescência de raios X, análise térmica e espectroscopia de reflectância total atenuada-ATR. Os difratogramas de raios X dos pós compósitos mostraram que, com o aumento da temperatura de calcinação, não houve a completa transição de fase anatásio-rutilo, uma vez que, em todas as temperaturas estudadas (300, 500, 700, 900 e 1100C) foram observados picos da fase anatásio. A análise térmica mostrou que em 400C ocorreu à decomposição do alginato de sódio em carbonato de sódio e, acima de 600C, se observa um pico exotérmico referente à decomposição do carbonato de sódio que, na presença do dióxido de titânio, transforma-se em titanato de sódio, confirmados, também, através dos difratogramas de raios X, em que na temperatura de 700C observa-se picos referentes ao carbonato de sódio e em 900 e 1100C picos relacionados ao titanato de sódio. O titanato de sódio influenciou nas propriedades elétricas do material, pois com o aumento da temperatura houve um decréscimo na condutividade, provavelmente, devido à criação de vacâncias de Ti, uma vez que, o Na+ induz a redução dos íons Ti+4 para espécies Ti+3. Os espectros de infravermelho dos compósitos em formas de pó e de membrana mostraram um pequeno deslocamento nas bandas, quando comparados ao espectro do alginato de sódio puro, indicando que estes deslocamentos, mesmo que pequenos, têm indícios de miscibilidade entre o polímero e o material cerâmico
The alginates are copolymers of 1→4-linked β-D-mannuronic acid (M) and α-Lguluronic acid (G) residues that are arranjed in a block structure along a linear chain. Titanium dioxide, TiO2, is a ceramic material and can exist in three distinct crystallography forms: anatase, brookite and rutile. composites of organic and inorganic materials have better properties than the components alone. Thus, this study aims to synthesize, characterize and analyze the composite NaAlg-TiO2 in the form of powder and film. The synthesis of composite powders was performed using the sol-gel process and obtain the composite film was performed using the slow evaporation process, then the composites were analyzed by infrared spectroscopy, fluorescence x ray, thermal…
Advisors/Committee Members: José Alzamir Pereira da Costa, Jailson Vieira de Melo, Maria Gorette Cavalcante, Luiz Henrique Dall Antonia, Carlos Alberto Martinez-Huitle.
Subjects/Keywords: QUIMICA; Dióxido de titânio; Alginato de sódio; Compósitos; Titanium dioxide; Sodium alginate; Composites
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Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lisboa, M. S. (2011). Obtenção e caracterização do sistema compósito alginato de sódio-dióxido de titânio em formas de pó e de membrana. (Thesis). Universidade Federal do Rio Grande do Norte. Retrieved from http://bdtd.bczm.ufrn.br/tedesimplificado//tde_busca/arquivo.php?codArquivo=4937
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lisboa, Marcia Severiano. “Obtenção e caracterização do sistema compósito alginato de sódio-dióxido de titânio em formas de pó e de membrana.” 2011. Thesis, Universidade Federal do Rio Grande do Norte. Accessed February 28, 2021.
http://bdtd.bczm.ufrn.br/tedesimplificado//tde_busca/arquivo.php?codArquivo=4937.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lisboa, Marcia Severiano. “Obtenção e caracterização do sistema compósito alginato de sódio-dióxido de titânio em formas de pó e de membrana.” 2011. Web. 28 Feb 2021.
Vancouver:
Lisboa MS. Obtenção e caracterização do sistema compósito alginato de sódio-dióxido de titânio em formas de pó e de membrana. [Internet] [Thesis]. Universidade Federal do Rio Grande do Norte; 2011. [cited 2021 Feb 28].
Available from: http://bdtd.bczm.ufrn.br/tedesimplificado//tde_busca/arquivo.php?codArquivo=4937.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lisboa MS. Obtenção e caracterização do sistema compósito alginato de sódio-dióxido de titânio em formas de pó e de membrana. [Thesis]. Universidade Federal do Rio Grande do Norte; 2011. Available from: http://bdtd.bczm.ufrn.br/tedesimplificado//tde_busca/arquivo.php?codArquivo=4937
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universidade do Rio Grande do Norte
10.
Lisboa, Marcia Severiano.
Obtenção e caracterização do sistema compósito alginato de sódio-dióxido de titânio em formas de pó e de membrana
.
Degree: 2011, Universidade do Rio Grande do Norte
URL: http://repositorio.ufrn.br/handle/123456789/17745
► The alginates are copolymers of 1→4-linked β-D-mannuronic acid (M) and α-Lguluronic acid (G) residues that are arranjed in a block structure along a linear chain.…
(more)
▼ The alginates are copolymers of 1→4-linked β-D-mannuronic acid (M) and α-Lguluronic
acid (G) residues that are arranjed in a block structure along a linear chain.
Titanium dioxide, TiO2, is a ceramic material and can exist in three distinct crystallography
forms: anatase, brookite and rutile. composites of organic and inorganic materials have better
properties than the components alone. Thus, this study aims to synthesize, characterize and
analyze the composite NaAlg-TiO2 in the form of powder and film. The synthesis of
composite powders was performed using the sol-gel process and obtain the composite film
was performed using the slow evaporation process, then the composites were analyzed by
infrared spectroscopy, fluorescence x ray, thermal analysis, attenuated total reflection (ATR),
x ray diffraction and impedance spectroscopy. The X ray diffraction patterns of composite
powders show that with increasing calcination temperature, there were no complete transition
of rutile-anatase crystalline phase, since at all temperatures studied (300, 500, 700, 900 and
1100ºC) were observed peaks of anatase phase. Thermal analysis shows that at 400°C caused
the decomposition of
sodium alginate in
sodium carbonate and above 600°C, we observe an
exothermic peak related to the decomposition of
sodium carbonate and in the presence of
titanium dioxide becomes
sodium titanate. The XRD results confirm the formation of
sodium
carbonate at 700ºC and the formation
sodium titanate in the temperature range 900-1100ºC.
The
sodium titanate influenced the electrical properties of the material, because with
increasing temperature there was a decrease in conductivity, probably due to the creation of Ti
vacancies, since the
sodium can induce the reduction of surface Ti4+ ions into Ti3+ species.
The infrared spectra of the composites in the form of powder and film showed a small shift in
the bands compared to the spectrum of pure
alginate, indicating that these shifts, even small
ones, have evidence of miscibility between the polymer and ceramic material
Advisors/Committee Members: Cavalcante, Maria Gorette (advisor), CPF:10843329491 (advisor), http://lattes.cnpq.br/2069510469317474 (advisor).
Subjects/Keywords: Dióxido de titânio;
Alginato de sódio;
Compósitos;
Titanium dioxide;
Sodium alginate;
Composites
Record Details
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Record Details
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Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lisboa, M. S. (2011). Obtenção e caracterização do sistema compósito alginato de sódio-dióxido de titânio em formas de pó e de membrana
. (Doctoral Dissertation). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/17745
Chicago Manual of Style (16th Edition):
Lisboa, Marcia Severiano. “Obtenção e caracterização do sistema compósito alginato de sódio-dióxido de titânio em formas de pó e de membrana
.” 2011. Doctoral Dissertation, Universidade do Rio Grande do Norte. Accessed February 28, 2021.
http://repositorio.ufrn.br/handle/123456789/17745.
MLA Handbook (7th Edition):
Lisboa, Marcia Severiano. “Obtenção e caracterização do sistema compósito alginato de sódio-dióxido de titânio em formas de pó e de membrana
.” 2011. Web. 28 Feb 2021.
Vancouver:
Lisboa MS. Obtenção e caracterização do sistema compósito alginato de sódio-dióxido de titânio em formas de pó e de membrana
. [Internet] [Doctoral dissertation]. Universidade do Rio Grande do Norte; 2011. [cited 2021 Feb 28].
Available from: http://repositorio.ufrn.br/handle/123456789/17745.
Council of Science Editors:
Lisboa MS. Obtenção e caracterização do sistema compósito alginato de sódio-dióxido de titânio em formas de pó e de membrana
. [Doctoral Dissertation]. Universidade do Rio Grande do Norte; 2011. Available from: http://repositorio.ufrn.br/handle/123456789/17745
11.
Ciocoiu, Oana Nicoleta.
Grafting of sodium alginate with poly (N-isopropylacrylamide) chains. Study of the thermothickening behavior.
Degree: 2010, University of Patras
URL: http://nemertes.lis.upatras.gr/jspui/handle/10889/3213
► Designing new materials with improved or tailored properties is one of the main goals of the chemists. Two common ways are mainly used to get…
(more)
▼ Designing new materials with improved or tailored properties is one of the main goals of the chemists. Two common ways are mainly used to get a material with improved or new properties: blending or chemical synthesis. Chemical synthesis is an unlimited method to get new substances with well-defined properties even it is often time consuming and not seldom costly.A rheology study has shown a considerable increase in viscosity of 1% aqueous solutions, 40 and 120 times at 550C, for the graft copolymers with a composition 67 and 80% in PNIPAM respectively as temperature increases above 350C. This behaviour is also related with a critical concentration that has been found around 0.6% for the same copolymers.
Fluorescence measurements have shown that this behavior is related with the hydrophobic character and aggregation of PNIPAM chains by increasing temperature over 350C.
A dynamic light scattering study in dilute aqueous solutions by varying temperature could provide more information on the kind of the transition taking place and the nature of the particles formed as temperature increases.
Ο σχεδιασμός νέων υλικών με βελτιωμένες ιδιότητες είναι ένας από τους κύριους στόχους των χημικών. Δύο είναι οι πιο συνηθισμένοι τρόποι που χρησιμοποιούνται κυρίως για τη παραλαβή ενός υλικού με βελτιωμένες ή νέες ιδιότητες: ανάμειξη ή χημική σύνθεση. Χημική σύνθεση είναι η μέθοδος όπου λαμβάνονται νέα υλικά με καθορισμένες ιδιότητες αλλά έχει ως μειονέκτημα το κόστος και είναι συχνά χρονοβόρα.Μετρήσεις ρεολογίας έδειξαν μια αξιοσημείωτη αύξηση στο ιξώδες του 1% υδατικού διαλύματος, από 40 μέχρι 120 φορές στους 550C, για συστάσεις του εμβολιασμένου συμπολυμερούς σε PNIPAM 67 εως 80% αντίστοιχα, καθώς η θερμοκρασία αυξάνεται πάνω από τους 350C. Επιπλέον αυτή η συμπεριφορά σχετίζεται με μια κρίσιμη συγκέντρωση που βρέθηκε ίση με 0,6% για τα ίδια συμπολυμερή.
Μετρήσεις φθορισμού έδειξαν ότι αυτή η συμπεριφορά σχετίζεται άμεσα με τον υδρόφοβο χαρακτήρα του PNIPAM καθώς η θερμοκρασία αυξάνεται πάνω από τους 350C.
Μετρήσεις με δυναμική σκέδαση φωτός σε αραιά υδατικά διαλύματα σε διάφορες θερμοκρασίες μπορούν να δώσουν επιπλέον πληροφορίες για τη μετάπτωση που λαμβάνει χώρα και τη φύση των σωματιδίων όσο η θερμοκρασία αυξάνεται.
Advisors/Committee Members: Στάικος, Γεώργιος, Τσιοκόιου, Οάνα Νικολέτα, Τσιτσιλιάνης, Κωνσταντίνος, Μπόκιας, Γεώργιος, Στάικος, Γεώργιος.
Subjects/Keywords: Sodium alginate; Thermothickening; PNIPAM; 547.782; Αλγινικό οξύ; Μελέτη θερμικής συμπεριφοράς; Πολυ (Ν -ισοπροπυλακρυλαμίδιο)
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Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ciocoiu, O. N. (2010). Grafting of sodium alginate with poly (N-isopropylacrylamide) chains. Study of the thermothickening behavior. (Masters Thesis). University of Patras. Retrieved from http://nemertes.lis.upatras.gr/jspui/handle/10889/3213
Chicago Manual of Style (16th Edition):
Ciocoiu, Oana Nicoleta. “Grafting of sodium alginate with poly (N-isopropylacrylamide) chains. Study of the thermothickening behavior.” 2010. Masters Thesis, University of Patras. Accessed February 28, 2021.
http://nemertes.lis.upatras.gr/jspui/handle/10889/3213.
MLA Handbook (7th Edition):
Ciocoiu, Oana Nicoleta. “Grafting of sodium alginate with poly (N-isopropylacrylamide) chains. Study of the thermothickening behavior.” 2010. Web. 28 Feb 2021.
Vancouver:
Ciocoiu ON. Grafting of sodium alginate with poly (N-isopropylacrylamide) chains. Study of the thermothickening behavior. [Internet] [Masters thesis]. University of Patras; 2010. [cited 2021 Feb 28].
Available from: http://nemertes.lis.upatras.gr/jspui/handle/10889/3213.
Council of Science Editors:
Ciocoiu ON. Grafting of sodium alginate with poly (N-isopropylacrylamide) chains. Study of the thermothickening behavior. [Masters Thesis]. University of Patras; 2010. Available from: http://nemertes.lis.upatras.gr/jspui/handle/10889/3213
Universidade Estadual de Campinas
12.
Carvalho, Ana Gabriela da Silva, 1987-.
Estudo da inclusão de antocianinas de extrato da polpa de juçara ("Euterpe edulis" Martius) em partículas produzidas por spray drying e gelificação iônica: Study of the inclusion of anthocyanins from jussara pulp extract ("Euterpe edulis" Martius) in particles prepared by spray drying and ionic gelation.
Degree: 2017, Universidade Estadual de Campinas
URL: http://repositorio.unicamp.br/jspui/handle/REPOSIP/331912
► Abstract: Jussara palm ("Euterpe edulis" Martius) is a native species of the Brazilian Atlantic Forest that produces an edible palm heart. Apart from its palm…
(more)
▼ Abstract: Jussara palm ("Euterpe edulis" Martius) is a native species of the Brazilian Atlantic Forest that produces an edible palm heart. Apart from its palm heart, it also yields the jussara fruit, similar to the açaí fruit. Jussara fruit, when ripe, presents a purple pulp and a high content of anthocyanins and polyphenols. In order to take advantage of the functional properties and to increase the stability of these compounds, this study aimed to obtain extracts from jussara pulp and to produce particles by two different encapsulation methods, spray drying and ionic gelation. The jussara extracts were produced by hydroalcoholic extractions in an agitated bed and, later, in order to remove ethanol and to increase total solids content, they were concentrated in a rotary vacuum evaporator. The concentrated extracts were dried by spray drying process with an inlet air temperature of 160 °C, using maltodextrin with different dextrose equivalent values (10, 20 and 30 DE) and gum Arabic as carrier agents. Microparticles were characterized in relation to moisture content, water activity, hygroscopicity, glass transition temperature, particle size distribution, color, retention of anthocyanins and phenolic compounds, identification and quantification of individual anthocyanins, antioxidant capacity, microstructure by scanning electron microscope and confocal laser scanning microscope. The bioactive compounds from jussara extract were stabilized by spray drying process, in the form of microparticles, and showed high anthocyanins (above 88%) and phenolic retention values and high antioxidant capacity. The ionic gelation process consisted in dripping the
sodium alginate in a calcium chloride solution with the inclusion of the jussara extract occurring by absorption through the porous structure of the
alginate hydrogel beads. The beads were subjected to a coating process using chitosan, whey protein concentrate and gelatin and were analyzed in relation to moisture content, particle size distribution, uniaxial compression, anthocyanin content and antioxidant capacity, stability, release in simulated gastric and intestinal conditions and microstructure by scanning electron microscope and confocal laser scanning microscope. Ionic gelation process led to the formation of hydrogel beads containing anthocyanins from jussara extract, thus enabling the release profile of the compounds at specific pH conditions, as intestinal fluid. The inclusion of anthocyanins from jussara extract in particles produced by spray drying and ionic gelation maintained the stability of bioactive compounds in different polymer matrices, in the form of powder or hydrogel
Advisors/Committee Members: UNIVERSIDADE ESTADUAL DE CAMPINAS (CRUESP), Hubinger, Miriam Dupas, 1957- (advisor), Universidade Estadual de Campinas. Faculdade de Engenharia de Alimentos (institution), Programa de Pós-Graduação em Engenharia de Alimentos (nameofprogram), Trindade, Carmem Silvia Favaro (committee member), Alvim, Izabela Dutra (committee member), Tonon, Renata Valeriano (committee member), Germer, Silvia Pimentel Marconi (committee member).
Subjects/Keywords: Interações eletrostaticas; Antocianinas; Maltodextrina; Microencapsulação; Alginato de sódio; Electrostatic interactions; Anthocyanins; Maltodextrin; Microencapsulation; Sodium alginate
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APA (6th Edition):
Carvalho, Ana Gabriela da Silva, 1. (2017). Estudo da inclusão de antocianinas de extrato da polpa de juçara ("Euterpe edulis" Martius) em partículas produzidas por spray drying e gelificação iônica: Study of the inclusion of anthocyanins from jussara pulp extract ("Euterpe edulis" Martius) in particles prepared by spray drying and ionic gelation. (Thesis). Universidade Estadual de Campinas. Retrieved from http://repositorio.unicamp.br/jspui/handle/REPOSIP/331912
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Carvalho, Ana Gabriela da Silva, 1987-. “Estudo da inclusão de antocianinas de extrato da polpa de juçara ("Euterpe edulis" Martius) em partículas produzidas por spray drying e gelificação iônica: Study of the inclusion of anthocyanins from jussara pulp extract ("Euterpe edulis" Martius) in particles prepared by spray drying and ionic gelation.” 2017. Thesis, Universidade Estadual de Campinas. Accessed February 28, 2021.
http://repositorio.unicamp.br/jspui/handle/REPOSIP/331912.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Carvalho, Ana Gabriela da Silva, 1987-. “Estudo da inclusão de antocianinas de extrato da polpa de juçara ("Euterpe edulis" Martius) em partículas produzidas por spray drying e gelificação iônica: Study of the inclusion of anthocyanins from jussara pulp extract ("Euterpe edulis" Martius) in particles prepared by spray drying and ionic gelation.” 2017. Web. 28 Feb 2021.
Vancouver:
Carvalho, Ana Gabriela da Silva 1. Estudo da inclusão de antocianinas de extrato da polpa de juçara ("Euterpe edulis" Martius) em partículas produzidas por spray drying e gelificação iônica: Study of the inclusion of anthocyanins from jussara pulp extract ("Euterpe edulis" Martius) in particles prepared by spray drying and ionic gelation. [Internet] [Thesis]. Universidade Estadual de Campinas; 2017. [cited 2021 Feb 28].
Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/331912.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Carvalho, Ana Gabriela da Silva 1. Estudo da inclusão de antocianinas de extrato da polpa de juçara ("Euterpe edulis" Martius) em partículas produzidas por spray drying e gelificação iônica: Study of the inclusion of anthocyanins from jussara pulp extract ("Euterpe edulis" Martius) in particles prepared by spray drying and ionic gelation. [Thesis]. Universidade Estadual de Campinas; 2017. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/331912
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universidade Estadual de Campinas
13.
Faria, Mônica Huguenin de Araujo, 1971-.
Encapsulação do antibiótico tetraciclina em micropartículas de quitosana e alginato: Encapsulation of the antibiotic tetracycline in microparticles of chitosan and alginate.
Degree: 2018, Universidade Estadual de Campinas
URL: http://repositorio.unicamp.br/jspui/handle/REPOSIP/345610
► Abstract: Due to infection deaths, and the antimicrobial resistance, the purpose of this Thesis was to prepare and characterize aqueous suspensions of polymeric microparticles with…
(more)
▼ Abstract: Due to infection deaths, and the antimicrobial resistance, the purpose of this Thesis was to prepare and characterize aqueous suspensions of polymeric microparticles with bioadhesive properties to a sustained release of the antimicrobial tetracycline hydrochloride using substances recognized in literature as biocompatible and with low toxicity, aiming to a possible oral use. Microparticles were prepared by complexation of chitosan and
sodium alginate polyelectrolytes, cross-linked by calcium ions and addition of tetracycline. The adopted method of preparation was the mechanical shearing. Through the factorial trial design it was possible to obtain microparticles with different characteristics in terms of particle size, encapsulation efficiency, loading percentage, release time of 10% of tetracycline in simulated gastric fluid (t10%FGS), intestinal fluid (t10%FIS), and antimicrobial activity. Primary trials indicate that tetracycline release in simulated gastric fluid and in intestinal fluid ocurred progressively and sustained for about three days. Release profile reflects what was observed by Fourier-transform infrared spectroscopy (FTIR) - which shows that there is a difference in intensity and/or interation type between tetracycline, which has functional groups of cation nature, and the
alginate carboxylate group and the chitosan cation groups. In addition, the release profile was different in simulated intestinal fluid and gastric fluid, which suggests that the particles are sensible to the enviroment acidity, performance expected by a polyelectrolytes matrix. It was verified that the polymeric matrix reticulation and the creation of the coacervation complex was reducing the instant release (burst effect) without the need of matrix overlay. The drug kinetic release ajustment in certain preparations to the Higuchi mathematical model and others in the Korsmeyer-Peppas model was also verified; which indicated that the different preparations present different interactions between the particles and the drug, affecting their release in the studied enviroments. Antimicrobial efficiency trials indicated that, in some preparations, the tetracycline in the sustained release system kept its efficiency on the evaluated microorganisms, increasing when compared with the Clinical and Laboratory Standards Institute (CLSI, 2017) parameters in the Performance Standards for Antimicrobial Susceptibility Testing (M100S) document. The results suggest that one of the preparations holds the antimicrobial capacity for future formulation
Advisors/Committee Members: UNIVERSIDADE ESTADUAL DE CAMPINAS (CRUESP), Pessine, Francisco Benedito Teixeira, 1948- (advisor), Universidade Estadual de Campinas. Instituto de Química (institution), Programa de Pós-Graduação em Química (nameofprogram), Araujo Filho, Hiram da Costa (committee member), Silva, Gilbert (committee member), Ferreira, Marcia Miguel Castro (committee member), Corbi, Pedro Paulo (committee member).
Subjects/Keywords: Alginato de sódio; Quitosana; Tetraciclina; Micropartículas; Liberação sustentada; Sodium alginate; Chitosan; Tetracycline; Microparticles; Sustained release
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APA (6th Edition):
Faria, Mônica Huguenin de Araujo, 1. (2018). Encapsulação do antibiótico tetraciclina em micropartículas de quitosana e alginato: Encapsulation of the antibiotic tetracycline in microparticles of chitosan and alginate. (Thesis). Universidade Estadual de Campinas. Retrieved from http://repositorio.unicamp.br/jspui/handle/REPOSIP/345610
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Faria, Mônica Huguenin de Araujo, 1971-. “Encapsulação do antibiótico tetraciclina em micropartículas de quitosana e alginato: Encapsulation of the antibiotic tetracycline in microparticles of chitosan and alginate.” 2018. Thesis, Universidade Estadual de Campinas. Accessed February 28, 2021.
http://repositorio.unicamp.br/jspui/handle/REPOSIP/345610.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Faria, Mônica Huguenin de Araujo, 1971-. “Encapsulação do antibiótico tetraciclina em micropartículas de quitosana e alginato: Encapsulation of the antibiotic tetracycline in microparticles of chitosan and alginate.” 2018. Web. 28 Feb 2021.
Vancouver:
Faria, Mônica Huguenin de Araujo 1. Encapsulação do antibiótico tetraciclina em micropartículas de quitosana e alginato: Encapsulation of the antibiotic tetracycline in microparticles of chitosan and alginate. [Internet] [Thesis]. Universidade Estadual de Campinas; 2018. [cited 2021 Feb 28].
Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/345610.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Faria, Mônica Huguenin de Araujo 1. Encapsulação do antibiótico tetraciclina em micropartículas de quitosana e alginato: Encapsulation of the antibiotic tetracycline in microparticles of chitosan and alginate. [Thesis]. Universidade Estadual de Campinas; 2018. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/345610
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universidade Federal de Viçosa
14.
Cláudia Denise de Paula.
Utilização de taro na elaboração de farinha e de produto alimentício reestruturado frito.
Degree: 2009, Universidade Federal de Viçosa
URL: http://www.tede.ufv.br/tedesimplificado/tde_busca/arquivo.php?codArquivo=2271
► O objetivo deste trabalho foi elaborar reestruturado de rizomas filho (RF) e rizomas-mãe (RM) de taro, variedade Japonês, com ênfase no seu potencial de industrialização.…
(more)
▼ O objetivo deste trabalho foi elaborar reestruturado de rizomas filho (RF) e rizomas-mãe (RM) de taro, variedade Japonês, com ênfase no seu potencial de industrialização. A caracterização das matérias- primas (rizomas) e produtos derivados (farinhas e reestruturados) foi feita por meio de análises físico-químicas, instrumentais e sensoriais. O RM apresentou massa média de rizoma, maior teor de fibras e maior rendimento de farinha quando comparado ao RF. Reestruturados fritos de RF (RFRF) e RM (RFRM) foram obtidos a partir do purê e farinha destes rizomas, testando-se sistemas de gelificação de alginato-cálcio. Foi empregado um desenho composto rotativo central em que as variáveis independentes foram: alginato de sódio (0,23- 0,82 g/100 g), sulfato de cálcio (0,41-0,84 g/100 g) e tripolifosfato de sódio (0,06-0,21 g/100 g), totalizando 15 pontos experimentais, repetindo o ponto central cinco vezes, sendo avaliado quanto à umidade, lipídios, rendimento pós-fritura, cor (L*, a*, b*, ΔE* e ΔC*), firmeza e perfil de textura instrumental (elasticidade, coesividade, gomosidade e mastigabilidade). Foi observado que o teor de lipídios, rendimento pós-fritura, valor a* e gomosidade para RFRF e umidade, valor L*, a*, ΔE*, ΔC* e firmeza para RFRM apresentaram diferença significativa (p <0,10) para as combinações dos fatores alginato, sulfato e TSPP, porém não foi possível adequar uma equação de regressão preditiva. Com a utilização de ACP, pode-se estabelecer que o tratamento 3, dos RFRF contendo 0,35 g de alginato, 0,75 g de sulfato e 0,09 de TSPP foi o mais conveniente para estudar seu possível processamento industrial, pelo seu alto rendimento, baixo conteúdo em lipídios, coloração mais agradável, alta elasticidade e coesividade e baixa mastigabilidade, firmeza e gomosidade. Para os RFRM, o tratamento 2, contendo 0,70 g de alginato, 0,50 g de sulfato e 0,09 de TSPP, foi o mais conveniente pelo seu alto rendimento e umidade, baixo conteúdo em lipídios, coloração mais agradável, alta elasticidade, mastigabilidade, gomosidade e coesividade e baixa firmeza. Foi realizado um teste de ordenação-preferência, com vinte e oito consumidores, para as 15 amostras de reestruturado (RF e RM respectivamente). Foi feito um prévio agrupamento dos tratamentos, fixando as concentrações de CaSO4: grupo 1 (concentrações menores ou iguais a 0,50 g/ 100 g), grupo 2 (concentração intermediária 0,63 g/ 100 g) e grupo 3 (iguais ou superiores a 0,75 g/ 100 g). Quanto à preferência dos provadores, não foi verificada diferença entre as amostras dos grupos 1 (RF) e 2 (RM). Sete amostras foram selecionadas de cada reestruturado (RF e RM) para posterior avaliação sensorial descritiva quanto aos atributos de sabor, crocância, firmeza e residual de gordura, com oito provadores treinados. Os resultados mostraram que as formulações de RFRF e RFRM não foramdiferentes (p >0,05) para o atributo sabor no teste descritivo. As concentrações de 0,70 g/ 100 g de alginato desódio; 0,50 g/ 100 g de sulfato de cálcio e 0,09 g/ 100 g de TSPP (RFRF2 e…
Advisors/Committee Members: Valéria Paula Rodrigues Minim, Mário Puiatti, José Benício Paes Chaves, Maria Teresa Pedrosa da Silva Clerici, Mônica Ribeiro Pirozi.
Subjects/Keywords: Taro; Alginato de sódio; Reestruturado frito; TECNOLOGIA DE ALIMENTOS; Taro; Rried restructured; Sodium alginate
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APA (6th Edition):
Paula, C. D. d. (2009). Utilização de taro na elaboração de farinha e de produto alimentício reestruturado frito. (Thesis). Universidade Federal de Viçosa. Retrieved from http://www.tede.ufv.br/tedesimplificado/tde_busca/arquivo.php?codArquivo=2271
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Paula, Cláudia Denise de. “Utilização de taro na elaboração de farinha e de produto alimentício reestruturado frito.” 2009. Thesis, Universidade Federal de Viçosa. Accessed February 28, 2021.
http://www.tede.ufv.br/tedesimplificado/tde_busca/arquivo.php?codArquivo=2271.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Paula, Cláudia Denise de. “Utilização de taro na elaboração de farinha e de produto alimentício reestruturado frito.” 2009. Web. 28 Feb 2021.
Vancouver:
Paula CDd. Utilização de taro na elaboração de farinha e de produto alimentício reestruturado frito. [Internet] [Thesis]. Universidade Federal de Viçosa; 2009. [cited 2021 Feb 28].
Available from: http://www.tede.ufv.br/tedesimplificado/tde_busca/arquivo.php?codArquivo=2271.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Paula CDd. Utilização de taro na elaboração de farinha e de produto alimentício reestruturado frito. [Thesis]. Universidade Federal de Viçosa; 2009. Available from: http://www.tede.ufv.br/tedesimplificado/tde_busca/arquivo.php?codArquivo=2271
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Lithuanian University of Agriculture
15.
Auželienė,
Ingė.
Sąlygų parinkimas kriaušių genofondo ilgalaikiam
saugojimui.
Degree: Master, Agronomy, 2012, Lithuanian University of Agriculture
URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120613_120317-31636
;
► Magistrantūros studijų baigiamajame darbe pateikiami duomenys apie kriaušių klonų, augintų ex situ ir Pyrus communis veislių, augintų in vitro, kriosaugojimo sąlygas ir metodus bei lauko…
(more)
▼ Magistrantūros studijų baigiamajame darbe
pateikiami duomenys apie kriaušių klonų, augintų ex situ ir Pyrus
communis veislių, augintų in vitro, kriosaugojimo sąlygas ir
metodus bei lauko kolekcijoje surinktų vienmečių ūglių fitomerų
sterilinimo metodiką. Darbo objektas - Pyrus pyraster klonų
vienmečių ūglių ir Pyrus communis veislių eksplantų augimo
kūgeliai. Darbo metodai. Tyrimams naudoti vienmečiai ūgliai, paimti
augalų ramybės laikotarpiu ir kriaušių mikroūgliai, paimti iš in
vitro kultūros. Prieš tyrimą ūgliai buvo laikyti 0 ± 0,5 °C
temperatūroje, po to sukarpyti fitomerais. Pirmiausiai buvo
nustatytos tinkamiausios ūglių sterilinimo sąlygos. Naudoti
skirtingi sterilinantys tirpalai: sublimato 0,1 %, baliklis ACE 5%,
natriochipochloritas 0,5% (Towill, Ellis, 2008). In vitro eksplantų
augimo kūgeliai kriosaugojimui ruošti šiais metodais:
vitrifikacijos metodu, inkapsuliuojant – dehidratuojant,
inkapsuliuojant – vitrifikuojant. Darbo rezultatai. Sterilinant
kriaušių fitomerus, geriausia naudoti natriohipochlorito 0,5%
tirpalą, pasirenkant 5 min. sterilinimo laiką. Kriosaugojimui
galima naudoti tiek kriaušių fitomerus, tiek ir inkapsuliuotus
natrio alginate augimo kūgelius, tačiau inkapsuliuoti išlieka
gyvybingesni. Kriosaugojimui geriausia naudoti fitomerus, paimtus
iš vienmečių ūglių kriaušių gilios ramybės laikotarpiu, t. y.
gruodžio – sausio mėn. Kriaušių genotipas įtakoja augimo kūgelių
gyvybingumą po kriosaugojimo. Lėtai užšaldant augimo kūgelius, jie
geriau išgyvena... [toliau žr. visą tekstą]
The data on pears clone, cultivated breeds
ex situ and Pyrus communis , cultivated in vitro, cryopreservation
conditions and methods as well as a method of phytomer
sterilization of annual scions are provided in this final work of
master studies. The object of research - Pyrus pyraster clones
annual scions and Pyrus communis breed explants growing conics. The
methods of research. Annual scions were taken for a research, in a
sleeping period and pears microscions, taken from in vitro culture.
Prior to the research, the scions were preserved in 0 ± 0,5 °C
temperature, later were cut by phytomer. Primarily appropriate
scions sterilization conditions were set. Different sterile
solutions were used: sublimate 0,1 %, bleach ACE 5%,
natriochipochlorite 0,5% (Towill, Ellis, 2008). The following
methods were applied to prepare for cryopreservation of In vitro
explants growing conics: vitrification method, incapsulating –
dehydrating, incapsulating- vitrificating. The findings of the
research. During sterilization the pears phytomers, the best is
natriohipochlorite 0,5% solution by choosing a period 5 min
sterilization. Both pears phytomers and growing conics incapsulated
in sodium alginate can be applied for the cryopreservation, though
the incapsulated ones remain more viable. Phytomers, most
recommended to cryopreservation, are taken from annual scions in a
period of deep sleeping, i.e. in months of December – January. The
genotype of pears influences the vitality of growing conics... [to
full text]
Advisors/Committee Members: Stanys, Vidmantas (Master’s thesis supervisor), Tarasevičienė, Živilė (Master’s thesis reviewer), Ramaškevičienė, Asta (Master’s thesis reviewer).
Subjects/Keywords: Kriosaugojimas; Augimo
kūgeliai; Kriaušės; Natrio
alginatas; Genotipas;
Cryopreservation; Growing
conics; Pears; Sodium
alginate; Genotype
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Auželienė,
Ingė. (2012). Sąlygų parinkimas kriaušių genofondo ilgalaikiam
saugojimui. (Masters Thesis). Lithuanian University of Agriculture. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120613_120317-31636 ;
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Chicago Manual of Style (16th Edition):
Auželienė,
Ingė. “Sąlygų parinkimas kriaušių genofondo ilgalaikiam
saugojimui.” 2012. Masters Thesis, Lithuanian University of Agriculture. Accessed February 28, 2021.
http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120613_120317-31636 ;.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
MLA Handbook (7th Edition):
Auželienė,
Ingė. “Sąlygų parinkimas kriaušių genofondo ilgalaikiam
saugojimui.” 2012. Web. 28 Feb 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Vancouver:
Auželienė,
Ingė. Sąlygų parinkimas kriaušių genofondo ilgalaikiam
saugojimui. [Internet] [Masters thesis]. Lithuanian University of Agriculture; 2012. [cited 2021 Feb 28].
Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120613_120317-31636 ;.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Council of Science Editors:
Auželienė,
Ingė. Sąlygų parinkimas kriaušių genofondo ilgalaikiam
saugojimui. [Masters Thesis]. Lithuanian University of Agriculture; 2012. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120613_120317-31636 ;
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Clemson University
16.
Herran, Leigh.
JET INSTABILITY AND DROPLET FORMATION FOR BIO-PRINTING APPLICATIONS.
Degree: PhD, Mechanical Engineering, 2013, Clemson University
URL: https://tigerprints.clemson.edu/all_dissertations/1195
► The research conducted in this dissertation was done to obtain a fundamental understanding of the formation of droplets in a drop-on-demand (DOD) inkjetting setup…
(more)
▼ The research conducted in this dissertation was done to obtain a fundamental understanding of the formation of droplets in a drop-on-demand (DOD) inkjetting setup when the ink contains a polymer additive. The objective is to precisely control and even predict the forming dynamics and final droplet characteristics (velocity, size and satellite elimination). A polymeric fluid called
sodium alginate has been gaining attention due to its highly bio-compatible nature. Solutions of
sodium alginate were used as the ink material and in some cases compared with an equivalent Newtonian fluid (same zero-shear viscosity). The droplets were inspected in one of two ways: 1) allow the
alginate droplets to fall into a bath of calcium chloride causing gelation, then observing the gelled droplets ('microspheres') with use of a microscope camera; or 2) visualizing the dynamics of droplet formation with a stroboscopic flash photographic system. The DOD waveform and material property effects on the final droplet characteristics are extensively studied. The DOD waveform parameters significantly affected the droplet formation. Since there are many input waveform parameters that can be adjusted, it is a great challenge to fundamentally understand and to optimize the printing process in terms of the DOD process. First, all of the parameters are studied (voltage amplitudes, dwell times, pulse times and frequency) with a statistical method do determine those that are most influential for droplet formation using two different types of input: bipolar and tripolar waveforms. From this it was found that the bipolar waveform is more robust than the tripolar and that the voltage amplitude and the dwell time are the most significant waveform conditions. Then the DOD process was characterized in a single parameter called the ejection velocity (Dong et al. 2005). The velocity of the ejecting fluid during the very first moments of ejection is a function of only the waveform and the material property influence can be neglected. This is true for Newtonian fluids and was found to be true for dilute solutions of
alginate. Using this ejection velocity the DOD process can be represented with the Weber (We) number. In micro-scale DOD inkjet printing, there are also limitations for the ink material to be printed in order to obtain successful droplet formation (uniform, single droplets). Since
sodium alginate is a polymeric fluid it has a chain-like molecular architecture, with liquid and solid-like properties which classifies it as a viscoelastic fluid. In this work,
sodium alginate was characterized in terms of its relevant physical properties. Understanding the ink behavior in terms of its viscoelastic properties will give insight to the fluid limitations for good printability (i.e. printing conditions that lead to successful droplet cases). The
alginate solutions were found to lie in one of three regimes according to its concentration: dilute, semi-dilute unentangled and semi-dilute entangled. The
alginate was compared to a Newtonian ink to…
Advisors/Committee Members: Coutris, Nicole, Miller , Richard, Dean , Delphine.
Subjects/Keywords: bio-printing; Drop-on-demand; Inkjet printing; Jet instability; Polymer rheology; Sodium alginate; Mechanical Engineering
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Herran, L. (2013). JET INSTABILITY AND DROPLET FORMATION FOR BIO-PRINTING APPLICATIONS. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/1195
Chicago Manual of Style (16th Edition):
Herran, Leigh. “JET INSTABILITY AND DROPLET FORMATION FOR BIO-PRINTING APPLICATIONS.” 2013. Doctoral Dissertation, Clemson University. Accessed February 28, 2021.
https://tigerprints.clemson.edu/all_dissertations/1195.
MLA Handbook (7th Edition):
Herran, Leigh. “JET INSTABILITY AND DROPLET FORMATION FOR BIO-PRINTING APPLICATIONS.” 2013. Web. 28 Feb 2021.
Vancouver:
Herran L. JET INSTABILITY AND DROPLET FORMATION FOR BIO-PRINTING APPLICATIONS. [Internet] [Doctoral dissertation]. Clemson University; 2013. [cited 2021 Feb 28].
Available from: https://tigerprints.clemson.edu/all_dissertations/1195.
Council of Science Editors:
Herran L. JET INSTABILITY AND DROPLET FORMATION FOR BIO-PRINTING APPLICATIONS. [Doctoral Dissertation]. Clemson University; 2013. Available from: https://tigerprints.clemson.edu/all_dissertations/1195
Clemson University
17.
Sa, Vijoya.
Highly conductive carbon nanotube fibers for biomedical applications.
Degree: PhD, Materials Science and Engineering, 2011, Clemson University
URL: https://tigerprints.clemson.edu/all_dissertations/839
► We developed a wet spinning process for the formation of polymeric fibers with high loading of single walled carbon nanotubes. The dissertation consists of five…
(more)
▼ We developed a wet spinning process for the formation of polymeric fibers with high loading of single walled carbon nanotubes. The dissertation consists of five chapters. In the first chapter, the research goals were formulated and the art and technologies of fiber spinning from carbon nanotubes were critically analyzed. The next three chapters report the original results. Last chapter summarizes all the findings. In the second chapter, we describe a surfactant based method of stabilization of carbon nanotube dispersions. The conditions of stability of nanotube dispersions in aqueous solutions of
sodium dodecyl sulfate were analyzed. Using surface tension isotherms, the phase diagram was experimentally constructed. The diagram covers a broad range of nanotube concentrations. The proposed method allowed us to analyze highly concentrated opaque dispersions, which are hard to study using traditional optical techniques. In the third chapter, we explain the process of electrostatic assembling of polyelectrolytes and nanotubes coated with
sodium dodecyl sulfate. Taking
sodium alginate as an example of a suitable polymer, we successfully wet spun fibers with various carbon nanotube loadings. The maximum concentration of nanotubes in the spun polymer fibers was 23 wt %, which is significantly greater than the percolation limit. It was shown that the Young's modulus of these fibers non-monotonically depends on nanotube concentration. The dependence was explained using Halpin-Tsai and Voigt models. Scanning electron microscope micrographs and resistivity analysis of the fibers suggest that the nanotube-
alginate system undergoes a morphological transition from a composite structure of discrete nanotube bundles embedded in an
alginate matrix to a complex continuous structure consisting of a nanotube network interwoven into a macro-molecular network of
alginate. These nanotube -
alginate fibers have unprecedented high flexibility and very high electrical conductivity - similar to semimetals (between germanium and carbon). In the fourth chapter, we report on a method to stabilize single walled carbon nanotube-
alginate fibers in aqueous solutions enriched with Na+ and K+ ions through covalent crosslinking of
alginate. The unmodified wet spun nanotube-
alginate fibers are unstable in electrolyte solutions such as phosphate buffered saline. This instability makes them unsuitable for biomedical applications as biosensor platforms or actuators. Therefore, these fibers were chemically modified through incorporation of covalent crosslinking to provide stability in solutions enriched with Na+ and K+ ions. Nano-pores were also introduced in the chemically modified fibers. We demonstrated that the modified
alginate-nanotube fibers are stable in electrolyte solutions and achieve volumetric swelling up to 16 times their original volume in buffer solutions in 10 minutes. Loading the fibers with nanotubes, we achieved much better tensile and compression properties compared to the covalently crosslinked…
Advisors/Committee Members: Kornev, Konstantin G, Rao , Apparao, Luzinov , Igor, Foulger , Stephen H.
Subjects/Keywords: Carbon nanotubes; Chemical modification; Composite fiber; Dispersion; Sodium alginate; Wet spinning; Materials Science and Engineering
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APA (6th Edition):
Sa, V. (2011). Highly conductive carbon nanotube fibers for biomedical applications. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/839
Chicago Manual of Style (16th Edition):
Sa, Vijoya. “Highly conductive carbon nanotube fibers for biomedical applications.” 2011. Doctoral Dissertation, Clemson University. Accessed February 28, 2021.
https://tigerprints.clemson.edu/all_dissertations/839.
MLA Handbook (7th Edition):
Sa, Vijoya. “Highly conductive carbon nanotube fibers for biomedical applications.” 2011. Web. 28 Feb 2021.
Vancouver:
Sa V. Highly conductive carbon nanotube fibers for biomedical applications. [Internet] [Doctoral dissertation]. Clemson University; 2011. [cited 2021 Feb 28].
Available from: https://tigerprints.clemson.edu/all_dissertations/839.
Council of Science Editors:
Sa V. Highly conductive carbon nanotube fibers for biomedical applications. [Doctoral Dissertation]. Clemson University; 2011. Available from: https://tigerprints.clemson.edu/all_dissertations/839
Laurentian University
18.
Huang, Lingqi.
Synthesis, properties and applications of functional polymer nanocomposites
.
Degree: 2018, Laurentian University
URL: https://zone.biblio.laurentian.ca/handle/10219/3218
► Polymer nanocomposites have been extensively studied and have found numerous applications as they provide versatile materials with substantially enhanced properties. Despite the enormous developments, design…
(more)
▼ Polymer nanocomposites have been extensively studied and have found numerous
applications as they provide versatile materials with substantially enhanced properties.
Despite the enormous developments, design of novel value-added polymer nanocomposites
with new superior functional properties through convenient low-cost synthesis remains a
continuous challenge. This thesis demonstrates the alternative, simple design of several novel
polymer nanocomposite systems with enhanced mechanical, surface, or catalytic properties.
Firstly, a new method for the modification of cellulose nanocrystals (CNCs) is
developed with the use of hyperbranched polyethylene ionomers containing cationic
quaternary ammonium ions through an ionic interaction mechanism. A systematic study has
been undertaken on the modification process and the modified CNCs. In contrast to original
CNCs that can only disperse in water or few highly polar solvents, ionomer modified CNCs
are able to disperse in several nonpolar or low polarity organic solvents. Dispersions of
several modified CNCs in THF exhibit the unique thixotropic rheological behavior. The
modified CNCs have also become dispersible in a commercial non-polar hydrophobic
ethylene-octene copolymer (EOC) elastomer due to the presence of nonpolar polyethylene
modification layer. Based on thermal, rheological, and tensile mechanical characterizations,
EOC nanocomposites filled with the modified CNCs are significantly reinforced with nearly
doubled tensile modulus relative to neat EOC while with a much better-maintained
elongation at break relative to those filled with unmodified CNCs or surfactant-modified
CNCs.
iv
Secondly, a class of CNC-sodium alginate (SA) nanocomposites derived exclusively
from sustainable biopolymers has been designed to fabricate tough-strong nanocomposite
film. A systematic study on the effects of composite composition on the optical, thermal, and
mechanical properties of the prepared films has been undertaken. The calcium ion crosslinked composite films maintain high film transparency with higher thermal and mechanical
properties than the uncross-linked films, indicating that the calcium ions play an important
role in the enhancement of mechanical and thermal properties. The effects of various metal
ions on film mechanical properties have also been studied. As a result, the bivalent calcium
ions show the most optimum effect to render strong-tough composite films.
Thirdly, hybrid composites of multi-walled carbon nanotubes (MWCNTs) decorated
with polycyclopentene crystals have been synthesized by a novel in situ Pd-catalyzed
cyclopentene polymerization technique. It is demonstrated that the method offers a
convenient, large-scale, one-pot noncovalent surface decoration of polycyclopentene crystals
on the MWCNTs. Controlling the catalyst loading and/or polymerization time in the
polymerization effectively tunes the composition and morphology of the as-prepared hybrid
composites. Interestingly, films made of the composites show the…
Subjects/Keywords: polymer nanocomposites;
cellulose nanocrystals;
CNCs;
multi-walled carbon nanotubes;
MWCNTs;
sodium alginate;
SA
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APA (6th Edition):
Huang, L. (2018). Synthesis, properties and applications of functional polymer nanocomposites
. (Thesis). Laurentian University. Retrieved from https://zone.biblio.laurentian.ca/handle/10219/3218
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Huang, Lingqi. “Synthesis, properties and applications of functional polymer nanocomposites
.” 2018. Thesis, Laurentian University. Accessed February 28, 2021.
https://zone.biblio.laurentian.ca/handle/10219/3218.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Huang, Lingqi. “Synthesis, properties and applications of functional polymer nanocomposites
.” 2018. Web. 28 Feb 2021.
Vancouver:
Huang L. Synthesis, properties and applications of functional polymer nanocomposites
. [Internet] [Thesis]. Laurentian University; 2018. [cited 2021 Feb 28].
Available from: https://zone.biblio.laurentian.ca/handle/10219/3218.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Huang L. Synthesis, properties and applications of functional polymer nanocomposites
. [Thesis]. Laurentian University; 2018. Available from: https://zone.biblio.laurentian.ca/handle/10219/3218
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
19.
van Tongeren, Edwin (author).
Towards a Circular Economy: Exploring the applications of 3D printing with mussel shell waste.
Degree: 2020, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:8fdfdd9b-0dde-450d-9ccb-874b4c0e2d9d
► Previous research proved the potential of using mussel shell waste as additive manufacturing (AM) material. In this thesis, mussel shell powder was combined with sodium…
(more)
▼ Previous research proved the potential of using mussel shell waste as additive manufacturing (AM) material. In this thesis, mussel shell powder was combined with sodium alginate, since it allows reversible cross-linking. Due to reversible cross-linking, this water-soluble and recyclable material can temporarily be made water-resistant, so it can be used for applications that need to be water-resistant. In this thesis, this material was researched, improved, and eventually used to print a prototype of a parametrically designed plant-specific planter.
Integrated Product Design
Advisors/Committee Members: Sauerwein, M. (mentor), Doubrovski, Zjenja (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: 3D Printing; Additive Manufacturing; Circulair Economy; Material Driven Design; Mussel shells; Sodium Alginate; Cross-links
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APA (6th Edition):
van Tongeren, E. (. (2020). Towards a Circular Economy: Exploring the applications of 3D printing with mussel shell waste. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:8fdfdd9b-0dde-450d-9ccb-874b4c0e2d9d
Chicago Manual of Style (16th Edition):
van Tongeren, Edwin (author). “Towards a Circular Economy: Exploring the applications of 3D printing with mussel shell waste.” 2020. Masters Thesis, Delft University of Technology. Accessed February 28, 2021.
http://resolver.tudelft.nl/uuid:8fdfdd9b-0dde-450d-9ccb-874b4c0e2d9d.
MLA Handbook (7th Edition):
van Tongeren, Edwin (author). “Towards a Circular Economy: Exploring the applications of 3D printing with mussel shell waste.” 2020. Web. 28 Feb 2021.
Vancouver:
van Tongeren E(. Towards a Circular Economy: Exploring the applications of 3D printing with mussel shell waste. [Internet] [Masters thesis]. Delft University of Technology; 2020. [cited 2021 Feb 28].
Available from: http://resolver.tudelft.nl/uuid:8fdfdd9b-0dde-450d-9ccb-874b4c0e2d9d.
Council of Science Editors:
van Tongeren E(. Towards a Circular Economy: Exploring the applications of 3D printing with mussel shell waste. [Masters Thesis]. Delft University of Technology; 2020. Available from: http://resolver.tudelft.nl/uuid:8fdfdd9b-0dde-450d-9ccb-874b4c0e2d9d
King Abdullah University of Science and Technology
20.
Alnajjar, Heba.
Carbon Dioxide Nucleation as a Novel Cleaning Method for Sodium Alginate Fouling Removal from Reverse Osmosis Membranes desalination.
Degree: Biological and Environmental Sciences and Engineering (BESE) Division, 2017, King Abdullah University of Science and Technology
URL: http://hdl.handle.net/10754/625069
► The use of Reverse osmosis (RO) membranes have been significantly increasing in water desalination, and the main operational obstacle in RO desalination plants is membrane…
(more)
▼ The use of Reverse osmosis (RO) membranes have been significantly increasing in water desalination, and the main operational obstacle in RO desalination plants is membrane fouling. Among other solutes, dissolved biopolymers, such as polysaccharides can lead to severe membrane fouling especially with the addition of calcium ions because of the complexation formation between the surface of membrane and foulants materials. However, this complexation can also take place in the feed bulk, resulting in foulants aggregates formation. Although there are some physical techniques that can maintain the membrane performance without reducing its lifetime, only chemical cleanings are still commonly used in RO plants. In this study, a novel cleaning method is proposed to restore the membrane performance by removing the deposited foulants without reducing the membrane lifetime. The cleaning method is based on using water saturated with dissolved CO2 gas, and its principle is based on producing spontaneous CO2 bubbles due to local pressure difference leading to nucleation of bubbles throughout the membrane surface, especially at nucleation sites, which improve the cleaning efficiency. Alginic acid
sodium salt was used as a model of polysaccharides foulants in presence of different concentrations of NaCl and calcium ions aiming to enhance membrane fouling, and then CO2 cleaning solution efficiency, in terms flux recovery (FR), was tested under different operating conditions and compared to other cleaning methods. Average FR of 20%±3, 25%±3 and 80%±3 for MilliQ water, a cleaning solution at pH4, and CO2 solution at 6 bar, 0.17 m/s, and 23 ̊C ±0.2 for 6 minutes were obtained, respectively. The efficiency of this novel cleaning method was also compared to direct osmosis overnight, and the average flux was comparable (about 60%±3), though that the cleaning time was significantly different. Various calcium concentrations (0-10 mM) were added in the
alginate solution to study the fouling behavior in terms of the potential for bulk complexation to form cake
alginate layer on the membrane surface rather than a gel layer, and the role of CO2 bubbles nucleation to remove foulants was investigated. This cleaning method can be considered as an alternative more environmentally friendly technique in RO application.
Advisors/Committee Members: Wang, Peng (advisor), Ghaffour, NorEddine (advisor), Amy, Gary L. (committee member), Leiknes, TorOve (committee member), Lai, Zhiping (committee member).
Subjects/Keywords: Carbon Dioxide Nucleation; Sodium Alginate Fouling; Reverse Osmosis Membranes; Membranes Desalination; Membrane Cleaning; Physical Cleaning
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APA (6th Edition):
Alnajjar, H. (2017). Carbon Dioxide Nucleation as a Novel Cleaning Method for Sodium Alginate Fouling Removal from Reverse Osmosis Membranes desalination. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/625069
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Alnajjar, Heba. “Carbon Dioxide Nucleation as a Novel Cleaning Method for Sodium Alginate Fouling Removal from Reverse Osmosis Membranes desalination.” 2017. Thesis, King Abdullah University of Science and Technology. Accessed February 28, 2021.
http://hdl.handle.net/10754/625069.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Alnajjar, Heba. “Carbon Dioxide Nucleation as a Novel Cleaning Method for Sodium Alginate Fouling Removal from Reverse Osmosis Membranes desalination.” 2017. Web. 28 Feb 2021.
Vancouver:
Alnajjar H. Carbon Dioxide Nucleation as a Novel Cleaning Method for Sodium Alginate Fouling Removal from Reverse Osmosis Membranes desalination. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2017. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/10754/625069.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Alnajjar H. Carbon Dioxide Nucleation as a Novel Cleaning Method for Sodium Alginate Fouling Removal from Reverse Osmosis Membranes desalination. [Thesis]. King Abdullah University of Science and Technology; 2017. Available from: http://hdl.handle.net/10754/625069
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
21.
Léonard, Lucie.
Evaluation du potentiel bioprotecteur de bactéries lactiques confinées dans une matrice polymérique : Lactic acid bacteria strains for bioprotection application with cells entrapment in biopolymeric matrices.
Degree: Docteur es, Sciences de l'alimentation, 2013, Université de Bourgogne
URL: http://www.theses.fr/2013DIJOS044
► Parmi les différentes méthodes de lutte contre les microorganismes pathogènes et/ou altérants en agroalimentaire, l’utilisation de bactéries lactiques (LAB) bioprotectrices s'avère être un outil prometteur…
(more)
▼ Parmi les différentes méthodes de lutte contre les microorganismes pathogènes et/ou altérants en agroalimentaire, l’utilisation de bactéries lactiques (LAB) bioprotectrices s'avère être un outil prometteur pour la préservation des aliments. Ce travail de thèse collaboratif, entre l'équipe PAPC (AgroSup Dijon, Université de Bourgogne) et le laboratoire BioDyMIA (Université Lyon1-Isara Lyon), concerne l'étude de systèmes bioprotecteurs immobilisant des cellules entières de LAB dans une matrice polymérique d'alginate de sodium et de caséinate de sodium pour une activité ciblée contre Listeria spp. Dans un premier temps, la méthodologie mise en œuvre a consisté à sélectionner des souches de LAB bioprotectrices sur la base de leur activité antimicrobienne évaluée par la méthode de diffusion en milieu gélosé contre trois souches de Listeria spp. Quatre souches sur 19 ont ainsi été sélectionnées. Une caractérisation partielle des métabolites antimicrobiens produits par ces 4 souches a ensuite été réalisée en appliquant des traitements thermiques et enzymatiques aux surnageants de culture correspondants pour évaluer si ces traitements altéraient l’activité des métabolites antimicrobiens présents. Une purification et une identification partielle des actifs antimicrobiens de nature peptidique ont été réalisées uniquement pour la souche d'intérêt principale : Lactococcus lactis LAB3. Dans un second temps, une formulation de la matrice polymérique d’immobilisation des LAB sélectionnées a été choisie en réalisant le diagramme de phases du système aqueux alginate de sodium/caséinate de sodium : 1,5 % (m/m) d'alginate de sodium / 4 % (m/m) de caséinate de sodium / 20 % (m/m) bouillon MRS. Cette formulation a permis d'obtenir une matrice composée d’une phase continue riche en alginate et d’une phase dispersée riche en caséinate dans laquelle les cellules de LAB se localisent préférentiellement d’après les observations en microscopie de fluorescence confocale à balayage laser. Suite à l'inclusion des cellules de LAB dans ces matrices liquides et gélifiées d'alginate seul et d'alginate/caséinate, leur cultivabilité et leur activité anti-Listeria ont été suivies à 30°C pendant 12 jours. Ceci a révélé que la cultivabilité et l’activité antimicrobienne des cellules de LAB se maintiennent à des niveaux plus élevés dans les matrices d'alginate/caséinate que dans celles uniquement à base d’alginate. Ces matrices à base d’alginate et de caséinate apparaissent donc comme un système prometteur pour l'immobilisation de LAB bioprotectrices. Leur intérêt pour l’inclusion de LAB a pu être corrélé à leur viabilité et à la structure composite de cette matrice à base de protéines qui favoriserait la production et la libération des métabolites antimicrobiens
Among the various methods to control foodborne pathogenic and/or food spoilage microorganisms in food chain, bioprotective lactic acid bacteria (LAB) appear to be promising tools for food biopreservation. This collaborative study, between PAPC (Agrosup Dijon, University of Burgundy) and…
Advisors/Committee Members: Saurel, Rémi (thesis director), Oulahal, Nadia (thesis director).
Subjects/Keywords: Bactéries lactiques; Biopréservation; Confinement; Séparation de phase; Caséinate de sodium; Alginate de sodium; Gel; Cultivabilité; Activité anti-Listeria; Lactic acid bacteria; Biopreservation; Entrapment; Aqueous two-phase system; Sodium caseinate; Sodium alginate; Gel; Culturability; Anti-listerial activity; 543; 547; 571.6; 572.4; 579; 664.028
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APA (6th Edition):
Léonard, L. (2013). Evaluation du potentiel bioprotecteur de bactéries lactiques confinées dans une matrice polymérique : Lactic acid bacteria strains for bioprotection application with cells entrapment in biopolymeric matrices. (Doctoral Dissertation). Université de Bourgogne. Retrieved from http://www.theses.fr/2013DIJOS044
Chicago Manual of Style (16th Edition):
Léonard, Lucie. “Evaluation du potentiel bioprotecteur de bactéries lactiques confinées dans une matrice polymérique : Lactic acid bacteria strains for bioprotection application with cells entrapment in biopolymeric matrices.” 2013. Doctoral Dissertation, Université de Bourgogne. Accessed February 28, 2021.
http://www.theses.fr/2013DIJOS044.
MLA Handbook (7th Edition):
Léonard, Lucie. “Evaluation du potentiel bioprotecteur de bactéries lactiques confinées dans une matrice polymérique : Lactic acid bacteria strains for bioprotection application with cells entrapment in biopolymeric matrices.” 2013. Web. 28 Feb 2021.
Vancouver:
Léonard L. Evaluation du potentiel bioprotecteur de bactéries lactiques confinées dans une matrice polymérique : Lactic acid bacteria strains for bioprotection application with cells entrapment in biopolymeric matrices. [Internet] [Doctoral dissertation]. Université de Bourgogne; 2013. [cited 2021 Feb 28].
Available from: http://www.theses.fr/2013DIJOS044.
Council of Science Editors:
Léonard L. Evaluation du potentiel bioprotecteur de bactéries lactiques confinées dans une matrice polymérique : Lactic acid bacteria strains for bioprotection application with cells entrapment in biopolymeric matrices. [Doctoral Dissertation]. Université de Bourgogne; 2013. Available from: http://www.theses.fr/2013DIJOS044
Technical University of Lisbon
22.
Botelho, Nuno Miguel Martins.
Novos adubos na produção de ervilha.
Degree: 2012, Technical University of Lisbon
URL: http://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/5315
► Mestrado em Engenharia Agronómica - Hortofruticultura e Viticultura - Instituto Superior de Agronomia
The present study was conducted in one of the pea producers of…
(more)
▼ Mestrado em Engenharia Agronómica - Hortofruticultura e Viticultura - Instituto Superior de Agronomia
The present study was conducted in one of the pea producers of Bonduelle (Portugal) Agroindústria,
S.A., in collaboration with the Department of Science and Biosystems Engineering (DCEB)
of the Instituto Superior of Agronomia and ADP-Fertilizantes, S.A.
The study aimed at evaluating the effect on commercial production and quality of pea, of four
experimental treatments, the control without fertilization, and three fertilizer formulations - NPK (20 kg
N, 51.4 kg P2O5 and 77 kg K2O per hectare), NPK + PGA (poly-!-glutamic acid and phytohormones)
and NPK + Algin (sodium alginate) on commercial production, tenderometric degree (TR) and alcohol
insoluble solids (AIS) of garden pea.
Statistical analysis revealed no significant differences between treatments and between blocks.
However, NPK + Algin led to higher production. NPK + PGA led to the best quality of grain and value
to the producer. Treatments with bio-fertilizers and/or biostimulants allowed more regular and
homogeneous pea production. The control and NPK showed the highest levels of nutrients in pea.
Advisors/Committee Members: Torres, Maria Odete Pereira, Vasconcelos, Ernesto Pestana.
Subjects/Keywords: pea; Pisum sativum; biofertilizers; poly-y-glutamic acid; sodium alginate; tenderometric degree (TR); alcohol insoluble solids (AIS)
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APA (6th Edition):
Botelho, N. M. M. (2012). Novos adubos na produção de ervilha. (Thesis). Technical University of Lisbon. Retrieved from http://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/5315
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Botelho, Nuno Miguel Martins. “Novos adubos na produção de ervilha.” 2012. Thesis, Technical University of Lisbon. Accessed February 28, 2021.
http://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/5315.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Botelho, Nuno Miguel Martins. “Novos adubos na produção de ervilha.” 2012. Web. 28 Feb 2021.
Vancouver:
Botelho NMM. Novos adubos na produção de ervilha. [Internet] [Thesis]. Technical University of Lisbon; 2012. [cited 2021 Feb 28].
Available from: http://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/5315.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Botelho NMM. Novos adubos na produção de ervilha. [Thesis]. Technical University of Lisbon; 2012. Available from: http://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/5315
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universidade do Rio Grande do Sul
23.
Fernandes, Juliana Machado.
Síntese e caracterização de cimento de alfa-fosfato tricálcico reforçado com hidrogel de alginato de sódio e PVA para aplicação médico-odontológica.
Degree: 2013, Universidade do Rio Grande do Sul
URL: http://hdl.handle.net/10183/96502
► Os cimentos de fosfato de cálcio (CFCs) têm atraído grande interesse para uso em ortopedia e odontologia como substitutos para partes danificadas do sistema esquelético,…
(more)
▼ Os cimentos de fosfato de cálcio (CFCs) têm atraído grande interesse para uso em ortopedia e odontologia como substitutos para partes danificadas do sistema esquelético, mostrando boa biocompatibilidade e osteointegração, permitindo sua utilização como enxerto ósseo. As características que determinam os CFCs biomateriais atrativos para a reconstituição ou remodelação óssea, são a facilidade de manipulação e moldagem, sem ter de dar forma prévia ao implante, adaptando-se totalmente à forma da cavidade óssea. Diversos estudos, têm mostrado que a adição de aditivos poliméricos tem uma forte influência sobre as propriedades do cimento. A baixa resistência mecânica é o principal obstáculo a uma maior utilização de CFC como material de implante. O objetivo deste trabalho foi avaliar as propriedades de um cimento com base em α-fosfato tricálcico (α -TCP ), adicionado de PVA (poli (álcool vinílico)) (10%, 8%, 6%), hidrogel de PVA (10%,8%,6%) reticulado com ácido cítrico (10%), hidrogel de alginato de sódio (2%) e poliacrilato de amônia (1%), todos em massa, foram adicionados ao pó de α -TCP sintetizado. As amostras foram moldadas e avaliadas quanto à densidade, porosidade, teste ―in vitro‖ (Simulated Body Fluid), fases cristalinas e propriedades mecânicas. Os resultados mostram o aumento das propriedades mecânicas do cimento, quando adicionado destes polímeros. A reticulação dos hidrogéis de PVA com ácido cítrico foi eficiente.O hidrogel de PVA, o hidrogel de alginato de sódio e o poliacrilato de amônia agiram como redutor de líquido.
The calcium phosphate cements (CPCs) have great interest for use in orthopedics and dentistry as replacements for damaged parts of the skeletal system, showing good biocompatibility and osseointegration, allowing its use as a bone graft. The characteristics that determine CPCs attractive biomaterials for bone remodeling or rebuilding, is ease of handling and molding, without having to shape prior to implantation, adapting itself fully to the shape of the bone cavity. Several studies in literature have shown that the addition of polymeric additives has a strong influence on the mechanical properties of cement. The low mechanical strength is the main impediment to a broader use of calcium phosphate bone cement as implant material. The aim of this work was evaluate the strength of a CPC based on α-tricalcium phosphate, with polymeric additions. CPC was synthesized and PVA (poli (vinyl alcohol)) (10%, 8%, 6%), sodium alginate hydrogel (2%) and ammonium polyacrylate (1%), all by weight, were added to the powder. Specimens were molded and evaluated for density, porosity, in vitro test (Simulated Body Fluid), crystalline phases and mechanical properties. The results show the increase of the mechanical properties of cement when added of polymeric additives. The crosslinking of PVA hydrogels with citric acid was effective. The PVA hydrogel, the hydrogel sodium alginate and ammonium polyacrylate acted as a reducing liquid.
Advisors/Committee Members: Santos, Luis Alberto dos.
Subjects/Keywords: Calcium phosphate cement; Cimento de fosfato tricálcico; Polyvinyl alcohol (PVA); Propriedades mecânicas; Alginato de sódio; Sodium alginate; Hidrogéis; Ammonium polyacrylate; Bioceramic
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APA (6th Edition):
Fernandes, J. M. (2013). Síntese e caracterização de cimento de alfa-fosfato tricálcico reforçado com hidrogel de alginato de sódio e PVA para aplicação médico-odontológica. (Thesis). Universidade do Rio Grande do Sul. Retrieved from http://hdl.handle.net/10183/96502
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Fernandes, Juliana Machado. “Síntese e caracterização de cimento de alfa-fosfato tricálcico reforçado com hidrogel de alginato de sódio e PVA para aplicação médico-odontológica.” 2013. Thesis, Universidade do Rio Grande do Sul. Accessed February 28, 2021.
http://hdl.handle.net/10183/96502.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Fernandes, Juliana Machado. “Síntese e caracterização de cimento de alfa-fosfato tricálcico reforçado com hidrogel de alginato de sódio e PVA para aplicação médico-odontológica.” 2013. Web. 28 Feb 2021.
Vancouver:
Fernandes JM. Síntese e caracterização de cimento de alfa-fosfato tricálcico reforçado com hidrogel de alginato de sódio e PVA para aplicação médico-odontológica. [Internet] [Thesis]. Universidade do Rio Grande do Sul; 2013. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/10183/96502.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Fernandes JM. Síntese e caracterização de cimento de alfa-fosfato tricálcico reforçado com hidrogel de alginato de sódio e PVA para aplicação médico-odontológica. [Thesis]. Universidade do Rio Grande do Sul; 2013. Available from: http://hdl.handle.net/10183/96502
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universidade do Rio Grande do Norte
24.
Morais, William Gomes de.
Confecção e caracterização físico-química de filmes compósitos
autossustentáveis NaAlg-TiO2-WO3
.
Degree: 2013, Universidade do Rio Grande do Norte
URL: http://repositorio.ufrn.br/handle/123456789/17739
► A new self-sustainable film was prepared through the sol-gel modified method, previously employed in our research group; sodium alginate was used as the polymer matrix,…
(more)
▼ A new self-sustainable film was prepared through the sol-gel modified method,
previously employed in our research group;
sodium alginate was used as the polymer
matrix, along with plasticizer glycerol, doped with titanium dioxide (TiO2) and tungsten
trioxide (WO3). By varying WO3 concentration (0,8, 1,6, 2,4 and 3,2 μmol) and keeping
TiO2 concentration constant (059 mmol), it was possible to study the contribution of these
oxides on the obtained films morphological and electrical properties. Self-sustainable
films have analyzed by Fourier Transform Infrared Spectroscopy (FTIR), X-Ray
Diffraction (XDR), Scanning Electron Microscope (SEM), Energy Dispersive X-ray
Spectroscopy (EDS) and Electrochemical Impedance Spectroscopy (EIS). By the IR
specters, it was possible identify the TiO2, and posteriorly WO3, addition has provided
dislocation of
alginate characteristics bands to smaller vibrations frequencies indicating
an electrostatic interaction between the oxides and the polymer matrix. Diffractograms
show predominance of the amorphous phase in the films. SEM, along with EDX, analysis
revealed self-sustainable films showed surface with no cracks and relative dispersion of
the oxides throughout the polymer matrix. From Impedance analysis, it was observe
increasing WO3 concentration to 2,4 μmol provided a reduction of films resistive
properties and consequent improvement of conductive properties
Advisors/Committee Members: Cavalcante, Maria Gorette (advisor), CPF:10843329491 (advisor), http://lattes.cnpq.br/2069510469317474 (advisor).
Subjects/Keywords: Filmes autossustentáveis. Alginato de sódio. TiO2. WO3. Impedância eletroquímica;
Self-sustainable films. Sodium alginate. TiO2. WO3. Electrochemical impedance
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APA ·
Chicago ·
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CSE |
Export
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Manager
APA (6th Edition):
Morais, W. G. d. (2013). Confecção e caracterização físico-química de filmes compósitos
autossustentáveis NaAlg-TiO2-WO3
. (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/17739
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Morais, William Gomes de. “Confecção e caracterização físico-química de filmes compósitos
autossustentáveis NaAlg-TiO2-WO3
.” 2013. Thesis, Universidade do Rio Grande do Norte. Accessed February 28, 2021.
http://repositorio.ufrn.br/handle/123456789/17739.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Morais, William Gomes de. “Confecção e caracterização físico-química de filmes compósitos
autossustentáveis NaAlg-TiO2-WO3
.” 2013. Web. 28 Feb 2021.
Vancouver:
Morais WGd. Confecção e caracterização físico-química de filmes compósitos
autossustentáveis NaAlg-TiO2-WO3
. [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2013. [cited 2021 Feb 28].
Available from: http://repositorio.ufrn.br/handle/123456789/17739.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Morais WGd. Confecção e caracterização físico-química de filmes compósitos
autossustentáveis NaAlg-TiO2-WO3
. [Thesis]. Universidade do Rio Grande do Norte; 2013. Available from: http://repositorio.ufrn.br/handle/123456789/17739
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
25.
Iwaki, Yurika Okamoto.
Eletrólitos sólidos poliméricos a base de alginato de sódio.
Degree: Mestrado, Ciência e Engenharia de Materiais, 2010, University of São Paulo
URL: http://www.teses.usp.br/teses/disponiveis/88/88131/tde-23032010-170752/
;
► Este trabalho teve como objetivo principal a preparação e caracterização de filmes de alginato de sódio plastificado com glicerol. Foram preparadas amostras de filmes variando-se…
(more)
▼ Este trabalho teve como objetivo principal a preparação e caracterização de filmes de alginato de sódio plastificado com glicerol. Foram preparadas amostras de filmes variando-se a concentração de ácido acético ou de perclorato de lítio, com a finalidade de otimizá-los como eletrólitos sólidos poliméricos (ESP) em dispositivos eletroquímicos, como sensores e baterias. Após o preparo dos filmes, estes foram caracterizados por análise elementar (AE), microscopia eletrônica de varredura (MEV), difração de raios-X, termogravimetria (TG), análise térmica mecânico dinâmica (DMTA), espectroscopia no UV-VIS, espectroscopia de infravermelho (IR) e espectroscopia de impedância eletroquímica (EIE). Os filmes preparados com alginato de sódio foram plastificados com 0,6 g de glicerol e apresentaram transparência nos comprimentos de onda da luz visível, boa condutividade iônica e maleabilidade. Através dos difratogramas de raios-X pode-se observar que os filmes possuem predominantemente caráter amorfo. O filme de alginato de sódio dopado com 0,3 mL ácido acético apresentou a melhor condutividade (8,7x10-5 S cm-1 a temperatura ambiente e de 1,15x10-3 S cm-1 a 80°C). Para amostras com quantidades maiores de ácido acético os filmes tornaram-se quebradiços e opacos. Para as amostras preparadas com perclorato de lítio a melhor condutividade obtida foi com o filme preparado utilizando 15% em massa de perclorato de lítio: 3,1x10-4 S cm-1 a temperatura ambiente e 1,2x10-3 S cm-1, a 80°C. As análises dos valores de condutividade em função da temperatura das amostras de alginato de sódio revelaram que este segue o modelo Vogel-Tamman-Fulcher (VTF) de condução, onde a movimentação das cadeias poliméricas auxilia na condução iônica. O valor de energia de ativação foi de 36,14 kJ mol-1 para a amostra com 0,3 mL de ácido acético foi de 36 kJ mol-1 para a amostra com 0,4 mL de ácido. Para os filmes preparados com 15% em massa de perclorato de lítio foi de 18,43 kJ mol-1. Essas novas membranas demonstraram ser candidata promissora para aplicação em diversos dispositivos eletroquímicos.
The aim of this study was the preparation and characterization of sodium alginate membranes plasticized with glycerol. The samples were obtained with different concentration of acetic acid or lithium perchlorate in order to use them as solid polymer electrolytes (SPE) in electrochemical devices, such as sensors and batteries. The films were characterized by elemental analysis (EA), scanning electron microscopy (SEM), X-ray, thermogravimetry (TG), dynamic-mechanical thermal analysis (DMTA), UV-visible spectroscopy, infrared spectroscopy (IR) and electrochemical impedance spectroscopy (IES). The samples plasticized with 0.6 g of glycerol showed good transparency, good ionic conductivity and flexibility. X-ray diffractograms evidenced predominantly amorphous state of the samples. The best ionic conductivity results of 8.7 x 10 -5 S cm -1 at room temperature and 1.15 x 10 - 3 S cm -1 at 80 ° C were obtained with sodium alginate samples containing 0.3 mL of acetic…
Advisors/Committee Members: Maule, Agnieszka Joanna Pawlicka.
Subjects/Keywords: Alginato de sódio; Condutividade iônica; Eletrólitos sólidos poliméricos; Ionic conductivity; Natural polymers; Polímeros naturais; Sodium alginate; Solid polymer electrolytes
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APA ·
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APA (6th Edition):
Iwaki, Y. O. (2010). Eletrólitos sólidos poliméricos a base de alginato de sódio. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/88/88131/tde-23032010-170752/ ;
Chicago Manual of Style (16th Edition):
Iwaki, Yurika Okamoto. “Eletrólitos sólidos poliméricos a base de alginato de sódio.” 2010. Masters Thesis, University of São Paulo. Accessed February 28, 2021.
http://www.teses.usp.br/teses/disponiveis/88/88131/tde-23032010-170752/ ;.
MLA Handbook (7th Edition):
Iwaki, Yurika Okamoto. “Eletrólitos sólidos poliméricos a base de alginato de sódio.” 2010. Web. 28 Feb 2021.
Vancouver:
Iwaki YO. Eletrólitos sólidos poliméricos a base de alginato de sódio. [Internet] [Masters thesis]. University of São Paulo; 2010. [cited 2021 Feb 28].
Available from: http://www.teses.usp.br/teses/disponiveis/88/88131/tde-23032010-170752/ ;.
Council of Science Editors:
Iwaki YO. Eletrólitos sólidos poliméricos a base de alginato de sódio. [Masters Thesis]. University of São Paulo; 2010. Available from: http://www.teses.usp.br/teses/disponiveis/88/88131/tde-23032010-170752/ ;
26.
Lira, Ana Amélia Moreira.
Desenvolvimento, caracterização e avaliação de sistemas microestruturados para veiculação de ácido retinóico na pele.
Degree: PhD, Medicamentos e Cosméticos, 2007, University of São Paulo
URL: http://www.teses.usp.br/teses/disponiveis/60/60137/tde-01122010-105253/
;
► Este trabalho propôe o desenvolvimento de micropartículas para veiculação deste fármaco na pele, aumentando a estabilidade da molécula e proporcionando uma liberação sustentada, o que…
(more)
▼ Este trabalho propôe o desenvolvimento de micropartículas para veiculação deste fármaco na pele, aumentando a estabilidade da molécula e proporcionando uma liberação sustentada, o que resulta na otimização da terapia, visto que ocorre a redução dos efeitos colaterais. As micropartículas foram produzidas por três métodos diferentes, os dois primeiros utilizando a quitosana como polímero e o último utilizando uma associação de alginato com quitosana. As micropartículas de quitosana resultaram em interação do fármaco veiculado com o polímero e desta forma a sua utilização como sistema de liberação para veiculação do fármaco estudado foi descartada. As micropartículas de alginato/quitosana encapsularam efetivamente o fármaco, resultando em partículas irregulares com diâmetro médio de 148m. Elas apresentaram liberação sustentada do ácido retinóico por um período compatível com sua utilização tópica e por isso, parecem ser adequados para garantir estabilidade ao fármaco. Além disso, elas diminuíram a retenção do fármaco no estrato córneo quando comparado ao fármaco livre, mantendo seus níveis nas outras camadas mais profundas da pele. Esse direcionamento sítio-específico poderia diminuir a sua irritação dérmica, possibilitando, dessa forma, juntamente com o aumento de sua estabilidade, a obtenção de efeitos terapêuticos com a utilização de doses menores. Também não foram observadas interações entre o fármaco e o polímero demonstrando que a matriz de alginato foi capaz de proteger o fármaco do contato e da interação com a quitosana. Além disso, o método utilizado mostrou ser simples e rápido, realizado em condições amenas, sem o inconveniente da utilização de agentes cross-linking químicos tóxicos, como o glutaraldeído.
This study proposes the development of microparticles for drug delivery into the skin, thus increasing molecule stability and providing sustained release that results in therapy optimization as a result of reduction in side-effects. The microparticles were produced by three different methods. The two first methods used chitosan as a polymer, and the third utilized a chitosanalginate association. The chitosan microparticles resulted in the interaction of the delivered drug with the polymer; hence, its use as a release system for delivery of the studied drug was disregarded. The alginate/chitosan microparticles effectively encapsulated the drug, resulting in irregular particles with a mean diameter of 148m. They exhibited sustained release of retinoic acid for a period of time that was compatible with topical application and, therefore, seem to be suitable to ensure drug stability. Additionally, the microparticles decreased drug retention in the stratum corneum as compared to the free drug, thus keeping its levels in other deeper layers of the skin. Such site-specific direction could reduce dermal irritation, consequently enabling, conjointly with stability increase, the achievement of therapeutic effects with the use of smaller doses. Drug-polymer interactions were also not observed, showing that the…
Advisors/Committee Members: Marchetti, Juliana Maldonado.
Subjects/Keywords: Acid Chitosan Sodium; Ácido retinóico; Alginate; Cutaneous Penetration.; Liberação Sustentada; Microparticles; Micropartículas; Penetração Cutânea; Quitosana Alginato; Retinoic; Sustained release
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lira, A. A. M. (2007). Desenvolvimento, caracterização e avaliação de sistemas microestruturados para veiculação de ácido retinóico na pele. (Doctoral Dissertation). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/60/60137/tde-01122010-105253/ ;
Chicago Manual of Style (16th Edition):
Lira, Ana Amélia Moreira. “Desenvolvimento, caracterização e avaliação de sistemas microestruturados para veiculação de ácido retinóico na pele.” 2007. Doctoral Dissertation, University of São Paulo. Accessed February 28, 2021.
http://www.teses.usp.br/teses/disponiveis/60/60137/tde-01122010-105253/ ;.
MLA Handbook (7th Edition):
Lira, Ana Amélia Moreira. “Desenvolvimento, caracterização e avaliação de sistemas microestruturados para veiculação de ácido retinóico na pele.” 2007. Web. 28 Feb 2021.
Vancouver:
Lira AAM. Desenvolvimento, caracterização e avaliação de sistemas microestruturados para veiculação de ácido retinóico na pele. [Internet] [Doctoral dissertation]. University of São Paulo; 2007. [cited 2021 Feb 28].
Available from: http://www.teses.usp.br/teses/disponiveis/60/60137/tde-01122010-105253/ ;.
Council of Science Editors:
Lira AAM. Desenvolvimento, caracterização e avaliação de sistemas microestruturados para veiculação de ácido retinóico na pele. [Doctoral Dissertation]. University of São Paulo; 2007. Available from: http://www.teses.usp.br/teses/disponiveis/60/60137/tde-01122010-105253/ ;
Universidade do Rio Grande do Norte
27.
Morais, William Gomes de.
Confecção e caracterização físico-química de filmes compósitos
autossustentáveis NaAlg-TiO2-WO3
.
Degree: 2013, Universidade do Rio Grande do Norte
URL: http://repositorio.ufrn.br/handle/123456789/17739
► A new self-sustainable film was prepared through the sol-gel modified method, previously employed in our research group; sodium alginate was used as the polymer matrix,…
(more)
▼ A new self-sustainable film was prepared through the sol-gel modified method,
previously employed in our research group;
sodium alginate was used as the polymer
matrix, along with plasticizer glycerol, doped with titanium dioxide (TiO2) and tungsten
trioxide (WO3). By varying WO3 concentration (0,8, 1,6, 2,4 and 3,2 μmol) and keeping
TiO2 concentration constant (059 mmol), it was possible to study the contribution of these
oxides on the obtained films morphological and electrical properties. Self-sustainable
films have analyzed by Fourier Transform Infrared Spectroscopy (FTIR), X-Ray
Diffraction (XDR), Scanning Electron Microscope (SEM), Energy Dispersive X-ray
Spectroscopy (EDS) and Electrochemical Impedance Spectroscopy (EIS). By the IR
specters, it was possible identify the TiO2, and posteriorly WO3, addition has provided
dislocation of
alginate characteristics bands to smaller vibrations frequencies indicating
an electrostatic interaction between the oxides and the polymer matrix. Diffractograms
show predominance of the amorphous phase in the films. SEM, along with EDX, analysis
revealed self-sustainable films showed surface with no cracks and relative dispersion of
the oxides throughout the polymer matrix. From Impedance analysis, it was observe
increasing WO3 concentration to 2,4 μmol provided a reduction of films resistive
properties and consequent improvement of conductive properties
Advisors/Committee Members: Cavalcante, Maria Gorette (advisor), CPF:10843329491 (advisor), http://lattes.cnpq.br/2069510469317474 (advisor).
Subjects/Keywords: Filmes autossustentáveis. Alginato de sódio. TiO2. WO3. Impedância eletroquímica;
Self-sustainable films. Sodium alginate. TiO2. WO3. Electrochemical impedance
Record Details
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Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Morais, W. G. d. (2013). Confecção e caracterização físico-química de filmes compósitos
autossustentáveis NaAlg-TiO2-WO3
. (Masters Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/17739
Chicago Manual of Style (16th Edition):
Morais, William Gomes de. “Confecção e caracterização físico-química de filmes compósitos
autossustentáveis NaAlg-TiO2-WO3
.” 2013. Masters Thesis, Universidade do Rio Grande do Norte. Accessed February 28, 2021.
http://repositorio.ufrn.br/handle/123456789/17739.
MLA Handbook (7th Edition):
Morais, William Gomes de. “Confecção e caracterização físico-química de filmes compósitos
autossustentáveis NaAlg-TiO2-WO3
.” 2013. Web. 28 Feb 2021.
Vancouver:
Morais WGd. Confecção e caracterização físico-química de filmes compósitos
autossustentáveis NaAlg-TiO2-WO3
. [Internet] [Masters thesis]. Universidade do Rio Grande do Norte; 2013. [cited 2021 Feb 28].
Available from: http://repositorio.ufrn.br/handle/123456789/17739.
Council of Science Editors:
Morais WGd. Confecção e caracterização físico-química de filmes compósitos
autossustentáveis NaAlg-TiO2-WO3
. [Masters Thesis]. Universidade do Rio Grande do Norte; 2013. Available from: http://repositorio.ufrn.br/handle/123456789/17739
Universidade Federal da Bahia
28.
Ana Emília Holanda Rolim.
Avaliação de microesferas de hidroxiapatita, dopadas ou não com estrôncio, no reparo de defeito ósseo crítico, em calvária de rato.
Degree: 2010, Universidade Federal da Bahia
URL: http://www.bibliotecadigital.ufba.br/tde_busca/arquivo.php?codArquivo=3070
► A bioengenharia tecidual tem possibilitado o desenvolvimento de biomateriais e técnicas inovadoras capazes de restituir a qualidade de vida aos pacientes com perdas ósseas, após…
(more)
▼ A bioengenharia tecidual tem possibilitado o desenvolvimento de biomateriais e técnicas inovadoras capazes de restituir a qualidade de vida aos pacientes com perdas ósseas, após a remoção de grandes tumores ósseos, traumas e em algumas doenças metabólicas. Dentre os biomateriais empregados nas terapias regenerativas destacam-se as biocerâmicas sintéticas, na forma de microesferas. Estas microesferas constituem um arcabouço que possibilita, no interstício formado entre as esferas, a difusão de fatores de crescimento e angiogênicos, a migração de cálulas osteogênicas essenciais à regeneração deste tecido. Ainda apresentam características físico-químicas semelhantes ao componente inorgânico do tecido ósseo e biocompatibilidade. O objetivo deste trabalho foi avaliar a regeneração de defeitos ósseos críticos, em calvária de rato. Para tanto, utilizou-se uma amostra composta de 60 animais, dividida em quatro grupos: Gl - defeito sem biomaterial, preenchido por coágulo; Gll - microesferas de hidroxiapatita e alginato (HA - Alg); Glll - microeferas de hidroxiapatita dopadas com estrôncio (HASr); GlV - microesferas de hidroxiapatita dopadas com estrôncio e alginato (HASr -Alg), avaliados aos 15, 45 e 120 dias de pós operatório. As análises histológicas, por microscopia de luz, demonstraram neoformação óssea mais evidente no grupo Gll em todos os pontos biológicos quando comparado aos demais grupos. As microesferas implantadas nos grupos lll e lV apresentaram maior fragmentação quando comparadas com as do grupo ll, provavelmente devido à adição de estrôncio à estrutura da HA. A neoformação óssea caracterizada pela osteocondução foi observada de permeio a esses fragmentos do biomaterial. No grupo lll, a ausência do alginato tornou as microesferas mais porosas, com formação de septos de tecido conjuntivo e células fusiformes no interior das microesferas. Em conclusão, os biomateriais apresentaram potencial osteogênico e osteocondutor formando um arcabouço tridimensional que favoreceu a neoformação óssea. A HA associada ao alginato apresentou características histológicas mais evidentes quanto a biocompatibilidade e a osteogênese, quando comparada a HA dopada com estrôncio.
Advisors/Committee Members: Fabiana Paim Rosa, Teresinha Costa de Santana, Maria Isabela Guimarães Campos.
Subjects/Keywords: bioengenharia tecidual; defeitos ósseos críticos; hidroxiapatita; estrôncio; alginato; bioengineered tissue; bone defects critics; hydroxiapatite; strontium; sodium alginate; ODONTOLOGIA
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APA ·
Chicago ·
MLA ·
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CSE |
Export
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APA (6th Edition):
Rolim, A. E. H. (2010). Avaliação de microesferas de hidroxiapatita, dopadas ou não com estrôncio, no reparo de defeito ósseo crítico, em calvária de rato. (Thesis). Universidade Federal da Bahia. Retrieved from http://www.bibliotecadigital.ufba.br/tde_busca/arquivo.php?codArquivo=3070
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Rolim, Ana Emília Holanda. “Avaliação de microesferas de hidroxiapatita, dopadas ou não com estrôncio, no reparo de defeito ósseo crítico, em calvária de rato.” 2010. Thesis, Universidade Federal da Bahia. Accessed February 28, 2021.
http://www.bibliotecadigital.ufba.br/tde_busca/arquivo.php?codArquivo=3070.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Rolim, Ana Emília Holanda. “Avaliação de microesferas de hidroxiapatita, dopadas ou não com estrôncio, no reparo de defeito ósseo crítico, em calvária de rato.” 2010. Web. 28 Feb 2021.
Vancouver:
Rolim AEH. Avaliação de microesferas de hidroxiapatita, dopadas ou não com estrôncio, no reparo de defeito ósseo crítico, em calvária de rato. [Internet] [Thesis]. Universidade Federal da Bahia; 2010. [cited 2021 Feb 28].
Available from: http://www.bibliotecadigital.ufba.br/tde_busca/arquivo.php?codArquivo=3070.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Rolim AEH. Avaliação de microesferas de hidroxiapatita, dopadas ou não com estrôncio, no reparo de defeito ósseo crítico, em calvária de rato. [Thesis]. Universidade Federal da Bahia; 2010. Available from: http://www.bibliotecadigital.ufba.br/tde_busca/arquivo.php?codArquivo=3070
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
29.
Virginia Guerra Elizei.
Evaluation of the viability of fungi encapsulated and stored at different temperatures.
Degree: 2009, UNIVERSIDADE FEDERAL DE LAVRAS
URL: http://bibtede.ufla.br/tede//tde_busca/arquivo.php?codArquivo=2361
► Cellular immobilization represents an alternative for the bioprocess conduction, where the cells are kept in a matrix and can be used over long periods. This…
(more)
▼ Cellular immobilization represents an alternative for the bioprocess conduction, where the cells are kept in a matrix and can be used over long periods. This work was conducted with the objective to test a fungi immobilization methodology with reduced cost, to evaluate the viability of these fungi when submitted to the new encapsulation method, and to determine the ideal temperature to store the immobilized fungi. The mycelium of the fungi Aspergillus niger, Cladosporium cladosporioides and Penicillium solitum were mixed with 15gr of titrated rice and 3gr of sodium alginate, which was dripped in a 0.25M calcium chloride solution for formation of the pellets. After drying in an oven at 26ÂC, the granules were stored at three temperatures: room ( 18 â 27 ÂC ) refrigerator (4 a 7 ÂC) and freezer (-3 a -6 ÂC). The platings were carried out every 15 days in BDA culture medium (potato-dextrose-agar). The evaluations of the colony size and sporulation were carried out after 7, 14 and 12 days of plating, during 195 days for A.niger, 225 days for C. cladosporioides, and 210 days for P.Solitum. Scanning Electronic Microscopy (SEM) analysis also took place seeking to verify the security of the encapsulated mycelium. The storage temperature did not affect the mycelial development of A.niger and P.solitum. However the sporulation was reduced for the granules stored in the freezer. The mycelial development of Cladosporium cladosporioides was influenced by the temperature. The granules conserved at room temperature had lower viability than those refrigerator and freezer stored. In the SEM analysis it was observed that the immobilization is a safe method where the fungus mycelium remains inside the granule, facilitating transport, storage and application of microorganisms.
A imobilizaÃÃo celular representa uma alternativa para a conduÃÃo de bioprocessos, quando cÃlulas ficam retidas em matrizes e podem ser utilizadas por longos perÃodos. Conduziu-se este trabalho, com o objetivo de testar uma nova metodologia de imobilizaÃÃo de fungos com custo reduzido, avaliar a viabilidade destes fungos quando submetidos ao novo mÃtodo de encapsulamento, e determinar a temperatura ideal para armazenar os fungos imobilizados. Os micÃlios dos fungos Aspergillus niger, Cladosporium cladosporioides e Penicillium solitum foram usados para a imobilizaÃÃo com 15gr de arroz triturado e 3gr de alginato de sÃdio que gotejava numa soluÃÃo de cloreto de cÃlcio a 0,25M para formaÃÃo dos grÃnulos. ApÃs a secagem em estufa a 26ÂC, os grÃnulos foram armazenados em trÃs temperaturas, ambiente (18 â 27 ÂC), geladeira (4 a 7 ÂC) e freezer (-3 a -6 ÂC). Os plaqueamentos foram realizados a cada 15 dias em meio de cultura BDA. As avaliaÃÃes do tamanho das colÃnias e esporulaÃÃo foram realizadas apÃs 7, 14 e 21 dias do plaqueamento, durante 195 dias para o A.niger, 225 dias para o C. cladosporioides, e 210 dias para P.solitum. Realizou-se tambÃm anÃlise de microscopia eletrÃnica de varredura visando verificar a seguranÃa do micÃlio encapsulado. A temperatura de…
Advisors/Committee Members: Luis Roberto Batista, Sara Maria Chalfoun, Carlos Josà Pimenta.
Subjects/Keywords: imobilizaÃÃo celular, encapsulamento de fungos, alginato de sÃdio, formulaÃÃo granulada; MICROBIOLOGIA; cellular immobilization, encapsulation of fungi, sodium alginate, granulated formulation
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APA (6th Edition):
Elizei, V. G. (2009). Evaluation of the viability of fungi encapsulated and stored at different temperatures. (Thesis). UNIVERSIDADE FEDERAL DE LAVRAS. Retrieved from http://bibtede.ufla.br/tede//tde_busca/arquivo.php?codArquivo=2361
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Elizei, Virginia Guerra. “Evaluation of the viability of fungi encapsulated and stored at different temperatures.” 2009. Thesis, UNIVERSIDADE FEDERAL DE LAVRAS. Accessed February 28, 2021.
http://bibtede.ufla.br/tede//tde_busca/arquivo.php?codArquivo=2361.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Elizei, Virginia Guerra. “Evaluation of the viability of fungi encapsulated and stored at different temperatures.” 2009. Web. 28 Feb 2021.
Vancouver:
Elizei VG. Evaluation of the viability of fungi encapsulated and stored at different temperatures. [Internet] [Thesis]. UNIVERSIDADE FEDERAL DE LAVRAS; 2009. [cited 2021 Feb 28].
Available from: http://bibtede.ufla.br/tede//tde_busca/arquivo.php?codArquivo=2361.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Elizei VG. Evaluation of the viability of fungi encapsulated and stored at different temperatures. [Thesis]. UNIVERSIDADE FEDERAL DE LAVRAS; 2009. Available from: http://bibtede.ufla.br/tede//tde_busca/arquivo.php?codArquivo=2361
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
30.
Fernanda Ferreira Freitas.
Otimização do processo de imobilização de Beta - galactosidase de Aspergillus oryzae em alginato de sódio com gelatina e glutaraldeído.
Degree: 2007, Federal University of Uberlândia
URL: http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1630
;
http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1631
;
http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1632
;
http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1633
;
http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1634
;
http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1635
► Neste trabalho estudou-se a influência conjunta das concentrações de alginato de sódio, gelatina e glutaraldeído no processo de imobilização de Beta-galactosidase de Aspergillus oryzae e…
(more)
▼ Neste trabalho estudou-se a influência conjunta das concentrações de alginato de sódio, gelatina e glutaraldeído no processo de imobilização de Beta-galactosidase de Aspergillus oryzae e a cinética de hidrólise de lactose pela enzima nas formas solúvel e imobilizada. A cinética da enzima na forma livre foi estudada a 35C, a pH 4,5, verificando que para concentrações de substrato de até 90g/L o modelo de Michaelis- Menten se ajustou aos resultados experimentais, com valores de Km e Vm iguais a 17,83 g/L (52,13 mM) e 1032,07 gglicose/L.min.mg proteína respectivamente. A galactose atuou como um inibidor competitivo na cinética da enzima na forma livre, apresentando constantes cinéticas Ki e Km com valores iguais a 1,015 e 17,61 g/L respectivamente. A enzima apresentou-se estável na faixa de pH de 4,5 a 7 e temperatura de máxima atividade de 55C, com energia de ativação de 6,9 kcal/mol. A estabilidade térmica da enzima foi estudada na faixa de 53 a 65C, apresentando meia vida de 7,7 horas a 53C. A energia de ativação do processo de desativação térmica foi de 88,14 kcal/mol. Por meio de um planejamento composto central as concentrações de alginato de sódio, gelatina e glutaraldeido que maximizaram a atividade de b-galactosidase de Aspergillus oryzae no processo de imobilização foram, respectivamente, 6,60% (p/v), 4,05% (p/v) e 3,64% (v/v). A enzima imobilizada apresentou queda de 20% na atividade após 25 usos. O rendimento de imobilização encontrado foi de 30%. A atividade enzimática para a forma imobilizada foi máxima a pH a 5,0, a 60C, determinados através de um planejamento composto central. A energia de ativação da reação usando a enzima imobilizada foi 7,74 kcal/mol. O biocatalisador imobilizado apresentou-se estável na faixa de pH de 4,5 a 7. O tempo de meia vida da enzima imobilizada foi 12,8 horas a 53C apresentando energia de ativação do processo de desativação térmica de 72,03 kcal/mol. A influência da concentração de substrato foi estudada para uma faixa de 5 a 140g/L de lactose e o Modelo de Michaelis-Menten ajustou-se bem aos dados experimentais, com valores de Vm e Km de 1032,07 glactose/min.m3catalisador e 20,62 g/L (60,3 mM), respectivamente. Em relação à enzima na forma imobilizada observou-se pequena resistência à transferência de massa de lactose nas partículas do biocatalisador, em função dos altos valores do fator de efetividade. O modelo de inibição competitivo ajustou-se bem aos dados experimentais e os valores de Km e Ki calculados foram 16,7 e 9,6g/L, respectivamente.
In this work was studied the simultaneous influence of sodium alginate, gelatin and glutaraldehyde concentrations in the immobilization process of Beta-galactosidase from Aspergillus oryzae and the kinetic of lactose hydrolysis by the enzyme in the soluble and immobilized forms. The free enzyme was studied at 35C and in a pH of 4.5, showing that for substrate concentrations up to 90g/L, the Michaelis-Menten model fitted the experimental data, with a Km and Vm value of 17.83 g/L (52.13 mM) and 1032.07 gglicose/L.min.mg proteína…
Advisors/Committee Members: Vicelma Luiz Cardoso, Eloizio Julio Ribeiro, Ubirajara Coutinho Filho, Miriam Maria de Resende, Alberto Colli Badino Junior, Ranulfo Monte Alegre.
Subjects/Keywords: Lactase; Imobilização; Alginato de sódio; Otimização; Cinética enzimática; ENGENHARIA QUIMICA; Enzimas; Imobilization; Sodium alginate; Optimization; En zyme kinetics
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Share »
Record Details
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Cite
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Freitas, F. F. (2007). Otimização do processo de imobilização de Beta - galactosidase de Aspergillus oryzae em alginato de sódio com gelatina e glutaraldeído. (Thesis). Federal University of Uberlândia. Retrieved from http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1630 ; http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1631 ; http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1632 ; http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1633 ; http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1634 ; http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1635
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Freitas, Fernanda Ferreira. “Otimização do processo de imobilização de Beta - galactosidase de Aspergillus oryzae em alginato de sódio com gelatina e glutaraldeído.” 2007. Thesis, Federal University of Uberlândia. Accessed February 28, 2021.
http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1630 ; http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1631 ; http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1632 ; http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1633 ; http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1634 ; http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1635.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Freitas, Fernanda Ferreira. “Otimização do processo de imobilização de Beta - galactosidase de Aspergillus oryzae em alginato de sódio com gelatina e glutaraldeído.” 2007. Web. 28 Feb 2021.
Vancouver:
Freitas FF. Otimização do processo de imobilização de Beta - galactosidase de Aspergillus oryzae em alginato de sódio com gelatina e glutaraldeído. [Internet] [Thesis]. Federal University of Uberlândia; 2007. [cited 2021 Feb 28].
Available from: http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1630 ; http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1631 ; http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1632 ; http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1633 ; http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1634 ; http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1635.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Freitas FF. Otimização do processo de imobilização de Beta - galactosidase de Aspergillus oryzae em alginato de sódio com gelatina e glutaraldeído. [Thesis]. Federal University of Uberlândia; 2007. Available from: http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1630 ; http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1631 ; http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1632 ; http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1633 ; http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1634 ; http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1635
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
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Open Access Theses and Dissertations