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You searched for +publisher:"Federal University of Uberlândia" +contributor:("Rafaela Karin de Lima"). Showing records 1 – 2 of 2 total matches.

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1. Cecília Soares Barbosa. Avaliação alelopática e caracterização fitoquímica do extrato em diclorometano de folhas de Curatella americana L. (Lixeira).

Degree: 2011, Federal University of Uberlândia

Current methods of controlling weeds have caused a dissatisfaction of social order, for putting at risk the quality of food for human or animal. Faced with this problem, associated with the appearance of more resistant species to current herbicides, it is necessary to find new methods of control. This paper describes a phytotoxic evaluation of diclorometanólico extract of leaves of Curatella americana (lixeira) in order to evaluate their efficiency in relation to the inhibition of seed germination of Panicum maximum (capim-colonião), in boxes Gerbox and greenhouse and the subsequent Panicum maximum characterization of allelopathic compounds responsible for inhibition. Were conducted germination, with a photoperiod of 10 hr for 7 days and with solutions of the extracts at concentrations of 0, 50, 100, 150, 200 and 250 ppm. The extract showed a high potential phytotoxic at concentrations similar to those used by commercial herbicides. In the qualitative identification of secondary metabolites present in the extract diclorometanólico sheet Curatella americana L. identificate flavonoids, anthraquinone aglycones, triterpenes, steroids, polyphenols and tannins. Identification the extract in Cromatography Gas: 3,7,11,15-Tetramethyl-2-hexadecen-1-ol, 2-Hexadeciloxirano; 1-(+)-ascorbic acid2,6-dihexadecanoate, Ethyl-hexadecanoate, and Ethyl-octadecanoate and Tetrapentacontano.

Os métodos atuais de controle das plantas daninhas têm provocado uma insatisfação de ordem social, por colocarem em risco a qualidade dos alimentos de uso humano e animal. Diante de tal problema, associado ao aparecimento de espécies mais resistentes aos atuais herbicidas, se faz necessário, a busca de novas alternativas de controle. O presente trabalho descreve uma avaliação fitotóxica do extrato em diclorometano de folhas de Curatella americana L. (lixeira) com o propósito de avaliar sua eficiência em relação à inibição na germinação, desenvolvimento das raízes e parte aérea de sementes de Panicum maximum (capim-colonião), em caixas Gerbox e em casa de vegetação, e a posterior caracterização dos compostos alelopáticos responsáveis pela inibição. Foram realizados testes de germinação, com fotoperíodo de 10 h por 7 dias e utilizando soluções dos extratos nas concentrações de 0, 50, 100, 150, 200 e 250 ppm. O extrato apresentou um elevado potencial fitotóxico, em concentrações semelhantes às utilizadas pelos herbicidas comerciais. Na análise qualitativa dos metabólitos secundários presentes no extrato em diclorometano de folhas de Curatella americana L. foram classificados flavonóides, agliconas antraquinônicas, triterpenos, esteróides, polifenóis e taninos. O mesmo foi analisado através da técnica de Cromatografia a Gás acoplada à espectrometria de Massas, no qual foram identificados seis picos principais, sendo eles: 3,7,11,15-Tetrametil-2-hexadecen-1-ol; 2-Hexadeciloxirano; 1-(+)-ácido ascórbico2,6-dihexadecanoato; Etil-hexadecanoato; Etil-octadecanoato e Tetrapentacontano.

Advisors/Committee Members: Manuel Gonzalo Hernandez Terrones, Roberto Chang, Rafaela Karin de Lima.

Subjects/Keywords: Herbicidas naturais; QUIMICA; Plantas - Efeito dos herbicidas; Diclorometano; Dichlorometane; Secondary metabolites; Extrato; Metabólitos secundários; Alelopatia; Extract; Natural herbicides

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Barbosa, C. S. (2011). Avaliação alelopática e caracterização fitoquímica do extrato em diclorometano de folhas de Curatella americana L. (Lixeira). (Thesis). Federal University of Uberlândia. Retrieved from http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=4154

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):

Barbosa, Cecília Soares. “Avaliação alelopática e caracterização fitoquímica do extrato em diclorometano de folhas de Curatella americana L. (Lixeira).” 2011. Thesis, Federal University of Uberlândia. Accessed September 25, 2020. http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=4154.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Barbosa, Cecília Soares. “Avaliação alelopática e caracterização fitoquímica do extrato em diclorometano de folhas de Curatella americana L. (Lixeira).” 2011. Web. 25 Sep 2020.

Vancouver:

Barbosa CS. Avaliação alelopática e caracterização fitoquímica do extrato em diclorometano de folhas de Curatella americana L. (Lixeira). [Internet] [Thesis]. Federal University of Uberlândia; 2011. [cited 2020 Sep 25]. Available from: http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=4154.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Barbosa CS. Avaliação alelopática e caracterização fitoquímica do extrato em diclorometano de folhas de Curatella americana L. (Lixeira). [Thesis]. Federal University of Uberlândia; 2011. Available from: http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=4154

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

2. Carla de Moura Martins. Estudo químico, atividade antioxidante, atividade antimicrobiana e análise do óleo essencial da espécie kielmeyera coriacea mart. &zucc (pau-santo) do cerrado.

Degree: 2012, Federal University of Uberlândia

Kielmeyera coriacea Mart. &Zucc, known as pau-santo, belongs to the family Clusiaceae. This plant is rich in xanthones, substances that exhibit various pharmacological properties. The objective of this study was to analyze and quantify the chemical constituents of the aerial parts, evaluate the antimicrobial and antioxidant activity of extracts and partitions of Kielmeyera coriacea. The percentages obtained for the macromolecular constituents of barks and wood are within the acceptable range for hardwood trees. The Klason lignin content found, was 14.7, 57.3 and 28.0 % and holocellulose was 30.0, 5.5 and 71.7 % for inner bark, outer bark and wood, respectively. The essential oils from different parts of Kielmeyera coriacea was analyzed for the first time in this work. The main identified compounds in the essential oil of leaf were sesquiterpenes, 51.3% of the oil consists of D-germacrene, trans-caryophyllene and bicyclogermacrene. In the flower, eugenol represents about 44.0 % of the essential oil, being the major constituent. Compared with essential oils of Kielmeyera rugosa, there were differences in the concentration of the components found in leaves and flowers of both species. In the inner bark, the most components are sesquiterpenes and constituents in higher concentrations were alpha-copaene (14.9 %), alpha-trans-bergamotene (13.0 %) and beta-bisabolene (9.4 %). In the outer bark, alkanes and sesquiterpenes are present in higher concentration. In the oil of wood, palmitic acid is the major component (16.2 %) and the alkanes are present in high concentration, together represent 51.3 % of essential oil. This essential oil can be considered an alternative source for 2-ethylhexyl-3-(4-methoxyphenyl)-2-propenoate (known as Parsol MCX, found in formulations of sunscreens). The levels of total phenols determined by Folin-Ciocalteau method, were 309, 346 and 372 expressed in Galic acid equivalents (GAC) per gram of sample, for ethanol extracts of leaves and inner bark and methanol-water partition of the inner bark, respectively. The inner bark was the sample that showed the highest content of proanthocyanidins with values of 328, 253 and 410 in catechin equivalents per gram of sample, for the ethanol extract, dichloromethane and methanol-water partitions, respectively. The inner bark was also the sample that showed the greatest antioxidant activity, with EC50 values of 5.9, 6.6 and 4.3 ppm for ethanol extract, dichloromethane and methanol-water partitions, respectively. The fractions 4, 5 and 6 of methanol-water partition from the inner bark presented good antioxidant activity with EC50 values of 4.7, 4.8 and 4.3 ppm, respectively. The analysis of fractions 5 and 6, obtained from the fractionation column of dichloromethane partition of the inner bark, which had high EC50 values, by HPLC, showed the presence of a few compounds, not yet identified in this study. The analysis of IV in extracts and fractions showed that the main functional groups present in the extracts were hydroxyl, carbonyl, presence of alkanes and C-O… Advisors/Committee Members: Francisco José Tôrres de Aquino, Welington Oliveira Cruz, Alberto de Oliveira, Rafaela Karin de Lima.

Subjects/Keywords: Kielmeyera coriacea; Análise química; Óleo essencial; Atividade antimicrobiana; QUIMICA; Química analítica; Chemical analysis; Essential oil; Antioxidant activity; Antimicrobial activity; Atividade antioxidante

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Martins, C. d. M. (2012). Estudo químico, atividade antioxidante, atividade antimicrobiana e análise do óleo essencial da espécie kielmeyera coriacea mart. &zucc (pau-santo) do cerrado. (Thesis). Federal University of Uberlândia. Retrieved from http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=4214

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):

Martins, Carla de Moura. “Estudo químico, atividade antioxidante, atividade antimicrobiana e análise do óleo essencial da espécie kielmeyera coriacea mart. &zucc (pau-santo) do cerrado.” 2012. Thesis, Federal University of Uberlândia. Accessed September 25, 2020. http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=4214.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Martins, Carla de Moura. “Estudo químico, atividade antioxidante, atividade antimicrobiana e análise do óleo essencial da espécie kielmeyera coriacea mart. &zucc (pau-santo) do cerrado.” 2012. Web. 25 Sep 2020.

Vancouver:

Martins CdM. Estudo químico, atividade antioxidante, atividade antimicrobiana e análise do óleo essencial da espécie kielmeyera coriacea mart. &zucc (pau-santo) do cerrado. [Internet] [Thesis]. Federal University of Uberlândia; 2012. [cited 2020 Sep 25]. Available from: http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=4214.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Martins CdM. Estudo químico, atividade antioxidante, atividade antimicrobiana e análise do óleo essencial da espécie kielmeyera coriacea mart. &zucc (pau-santo) do cerrado. [Thesis]. Federal University of Uberlândia; 2012. Available from: http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=4214

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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