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You searched for +publisher:"Michigan State University" +contributor:("SOTO-VALDEZ, HERLINDA"). One record found.

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Michigan State University

1. Samsudin, Hayati. Migration of antioxidants from poly(lactic acid), PLA, films into food simulants : a parameter estimation approach.

Degree: 2015, Michigan State University

Thesis Ph. D. Michigan State University. Packaging 2015.

ABSTRACTMIGRATION OF ANTIOXIDANTS FROM POLY(LACTIC ACID), PLA, FILMS INTO FOOD SIMULANTS: A PARAMETER ESTIMATION APPROACHByHayati SamsudinDevelopment of antioxidant active packaging has vastly increased over the years with more focus on biodegradable polymeric films and natural antioxidants. However, few studies investigated the migration of antioxidants from films into food simulants/products by fully considering the kinetic migration parameters. To the best of the author’s knowledge, a selective number of studies have simultaneously determined other migration parameters besides the diffusion coefficient (D), such as the convective mass transfer coefficient (h) and the partition coefficient (Kp,f). Thus, this dissertation explored experimental and theoretical approaches to gain insight on the migration kinetics of antioxidants from polymer films by using parameter estimation approaches (e.g., ordinary least square (OLS), sequential, bootstrap etc). A poly(lactic acid), PLA, functional film incorporated with marigold flower extract containing carotenoid-based antioxidant (i.e., astaxanthin) was developed and the kinetic release of astaxanthin from this film into 95% ethanol was investigated. The mass migrated at equilibrium (M∞) was estimated for the first time, in addition to the D. Further investigation was conducted on different migration case studies to compare the estimation of one parameter, 1P (i.e., the D) versus 2P (i.e., the D and the M∞) and 3P (i.e., the D, the M∞ and the ratio of the mass of antioxidant migrated into the simulant to the mass of the antioxidant left in the film at equilibrium (α)) using general mass transfer solutions. The 3P estimation based on the corrected Akaike information criterion (AICc) was found to better describe the migration experiment without compromising the estimation accuracy. The α parameter, experimentally determined at the end of the experiment and related to Kp,f by α=V_f/(K_(p,f) V_p ), was better estimated at early times without the need to reach equilibrium; however, these migration cases did not account for the convective mass transfer coefficient.Hence, a two-step solution was developed to simultaneously assess the D, Kp,f, and h from migration experiments. The first step of the solution was to identify the right local minima region for minimizing sums of squared errors (SSE) and to provide a robust magnitude approximation for the initial guesses used in the second step of the OLS estimation. The Kp,f parameter was directly used in this solution due to the ease of physical interpretation. h, the parameter that might be of importance in a non-stirring condition, viscous food product/simulant, etc. was also estimated and related to the overall migration resistance (Bi=(hL)/D). Commonly, h is not estimated. Neglecting h might lead to underestimation of D, thus compromising the accuracy of the parameter estimation. Different migration case studies were used as examples and the parameters were assessed using…

Advisors/Committee Members: AURAS, RAFAEL, DOLAN, KIRK, SELKE, SUSAN, SOTO-VALDEZ, HERLINDA, RUBINO, MARIA.

Subjects/Keywords: Polylactic acid – Additives; Plastic films – Additives; Antioxidants; Plastics in packaging; Packaging

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APA (6th Edition):

Samsudin, H. (2015). Migration of antioxidants from poly(lactic acid), PLA, films into food simulants : a parameter estimation approach. (Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:3595

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):

Samsudin, Hayati. “Migration of antioxidants from poly(lactic acid), PLA, films into food simulants : a parameter estimation approach.” 2015. Thesis, Michigan State University. Accessed February 20, 2019. http://etd.lib.msu.edu/islandora/object/etd:3595.

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

MLA Handbook (7th Edition):

Samsudin, Hayati. “Migration of antioxidants from poly(lactic acid), PLA, films into food simulants : a parameter estimation approach.” 2015. Web. 20 Feb 2019.

Vancouver:

Samsudin H. Migration of antioxidants from poly(lactic acid), PLA, films into food simulants : a parameter estimation approach. [Internet] [Thesis]. Michigan State University; 2015. [cited 2019 Feb 20]. Available from: http://etd.lib.msu.edu/islandora/object/etd:3595.

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

Council of Science Editors:

Samsudin H. Migration of antioxidants from poly(lactic acid), PLA, films into food simulants : a parameter estimation approach. [Thesis]. Michigan State University; 2015. Available from: http://etd.lib.msu.edu/islandora/object/etd:3595

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

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