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Molecular mobility and oxygen permeability in amorphous β-lactoglobulin films

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Title
Molecular mobility and oxygen permeability in amorphous β-lactoglobulin films
Name (ID = NAME001); (type = personal)
NamePart (type = family)
Sundaresan
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Kasi Visalakshi
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Kasi Visalakshi Sundaresan
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author
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Ludescher
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Richard
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Advisory Committee
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Richard D Ludescher
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chair
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Huang
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Qingrong
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Advisory Committee
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Qingrong Huang
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dissertation committee member
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Takhistov
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Paul
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Advisory Committee
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Paul Takhistov
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internal member
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Friedman
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Joel
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Advisory Committee
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Joel Friedman
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outside member
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Rutgers University
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degree grantor
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Graduate School - New Brunswick
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theses
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DateCreated (qualifier = exact)
2008
DateOther (qualifier = exact); (type = degree)
2008-01
Language
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English
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electronic
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text/xml
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xxx, 448 pages
Abstract
Edible films and coatings are developed to extend the shelf life of food products. Our overall objective is to understand how molecular mobility modulates diffusion rates and thus chemical reactivity in films made from amorphous β-lactoglobulin. The phosphorescence emission spectra and lifetimes of the triplet probe erythrosin B embedded in the β-Lg films provide measures of the modes, rates, and distribution of molecular mobility in the film, providing the molecular detail necessary to connect food quality and stability to molecular structure and mobility. The mobility contours generated from this research provided us with information about the onset temperature and level of molecular mobility required to support permeability of atmospheric oxygen. In β-Lg -- based binary matrices, sugars (sucrose, trehalose, maltose), plasticizers (glycerol, sorbitol, maltitol and PEG-400), fatty acids (palmitic acid, caprylic acid) and protein (BSA) were selected to investigate how variations in composition influence the molecular mobility and oxygen permeability in amorphous β-Lg matrix. Further more complicated β-Lg -- based ternary matrices (maltose and maltitol) and (PEG and sucrose) were generated inorder to gain a deeper understanding of edible films.
In pure β-Lg films there was linear correlation between molecular mobility and oxygen permeability. Various additives showed different results with respect to mobility and permeability. The addition of sucrose, maltose, maltitol and trehalose greatly reduced the mobility and the permeability of the β-Lg matrix. Glycerol exhibited an anti-plasticization effect and showed decreased mobility at a molar ratio of 1:1 glycerol/ β-Lg. PEG greatly enhanced the permeability of β-Lg matrix. Fatty acids palmitic acid and caprylic acid had a rigidification effect on the matrix with no change in permeability. We were able to detect dynamic synergies in β-Lg maltose and maltitol mixtures, whereby these sugar- polyol mixtures at equal ratios anti-plasticized the β-Lg matrix and at unequal ratios plasticized the matrix. The tertiary matrix comprising of β-Lg, PEG 400 and sucrose brought about a substantial reduction in the permeability. A better understanding of the mobility in these complex matrices will help improve the effectiveness of β-Lg in barrier applications in real food systems.
Note (type = degree)
Ph.D.
Note (type = bibliography)
Includes bibliographical references.
Subject (ID = SUBJ1); (authority = RUETD)
Topic
Food Science
Subject (ID = SUBJ2); (authority = ETD-LCSH)
Topic
Edible coatings
Subject (ID = SUBJ3); (authority = ETD-LCSH)
Topic
Food--Packaging
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Title
Graduate School - New Brunswick Electronic Theses and Dissertations
Identifier (type = local)
rucore19991600001
Identifier (type = hdl)
http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.17258
Identifier
ETD_743
Location
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NjNbRU
Identifier (type = doi)
doi:10.7282/T34B31QR
Genre (authority = ExL-Esploro)
ETD doctoral
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The author owns the copyright to this work.
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Open
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Name
Kasi Visalakshi Sundaresan
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Copyright holder
Affiliation
Rutgers University. Graduate School - New Brunswick
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Non-exclusive ETD license
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Author Agreement License
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I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
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