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Evidence for multiple oxidation pathways from non-volatile products of methyl linoleate

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TitleInfo
Title
Evidence for multiple oxidation pathways from non-volatile products of methyl linoleate
Name (type = personal)
NamePart (type = family)
Xie
NamePart (type = given)
Jia
NamePart (type = date)
1986-
DisplayForm
Jia Xie
Role
RoleTerm (authority = RULIB)
author
Name (type = personal)
NamePart (type = family)
Schaich
NamePart (type = given)
Karen M.
DisplayForm
Karen M. Schaich
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
chair
Name (type = personal)
NamePart (type = family)
HO
NamePart (type = given)
CHITANG
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CHITANG HO
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = personal)
NamePart (type = family)
Frenkel
NamePart (type = given)
Chaim
DisplayForm
Chaim Frenkel
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = personal)
NamePart (type = family)
Ngo
NamePart (type = given)
Helen L.
DisplayForm
Helen L. Ngo
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
outside member
Name (type = corporate)
NamePart
Rutgers University
Role
RoleTerm (authority = RULIB)
degree grantor
Name (type = corporate)
NamePart
Graduate School - New Brunswick
Role
RoleTerm (authority = RULIB)
school
TypeOfResource
Text
Genre (authority = marcgt)
theses
OriginInfo
DateCreated (qualifier = exact)
2015
DateOther (qualifier = exact); (type = degree)
2015-05
CopyrightDate (encoding = w3cdtf); (qualifier = exact)
2015
Place
PlaceTerm (type = code)
xx
Language
LanguageTerm (authority = ISO639-2b); (type = code)
eng
Abstract (type = abstract)
Oxidation of unsaturated lipids is the most active chemical reaction leading to deterioration of food quality and shortening of shelf life. Lipid oxidation is known to be a free radical chain reaction driven by lipid peroxyl and alkoxyl radicals abstracting hydrogen atoms from neighboring molecules to form stable hydroperoxide intermediates and transfer a radical to a new molecule. In this process, products accumulate only after hydroperoxides decompose. However, this simplistic reaction fails to account for observed kinetics and compounds generated. Recently, a more complex reaction scheme for lipid oxidation was proposed which integrates traditional hydrogen abstraction with alternate reactions of peroxyl and alkoxyl radicals -- internal rearrangement, double bond addition, scission, dismutation. The alternate reactions run simultaneously and in competition with hydrogen abstraction, and alter the overall picture of lipid oxidation under different conditions. This dissertation research seeks to provide experimental proof of principle that these alternate pathways exist in lipid oxidation and have important consequences to timing and types of products developed. Lipid oxidation was studied in pure methyl linoleate incubated for 20 days under a range of conditions to investigate early reactions. Four types of major oxidation non-volatile products (conjugated dienes, hydroperoxides, epoxides, and carbonyls) were measured to determine product distributions and impact of reaction conditions on pathways. Two observations supported activity of reaction pathways other than hydrogen abstraction. First, epoxides were the dominant product under all conditions, with levels higher than hydroperoxides and in some cases almost as high as conjugated dienes. Second, all products began accumulating immediately at start of oxidation, although at different rates. Carbonyls were produced at much lower levels than other products. Coordinated analyses of volatile products suggested that these unusual patterns could be explained by competitive activity of two alternate reactions: 1) peroxyl radicals add to double bonds, forming a dimer that decomposes to an epoxide and an alkoxyl radical which can either form more epoxides or undergo scission to carbonyl products; 2) alkoxyl radicals add to an adjacent double bond to form epoxides and transfer the free radical down chain to a new site. Environmental conditions mostly affected initial oxidation rates.
Subject (authority = RUETD)
Topic
Food Science
RelatedItem (type = host)
TitleInfo
Title
Rutgers University Electronic Theses and Dissertations
Identifier (type = RULIB)
ETD
Identifier
ETD_6442
PhysicalDescription
Form (authority = gmd)
electronic resource
InternetMediaType
application/pdf
InternetMediaType
text/xml
Extent
1 online resource (xiii, 146 p. : ill.)
Note (type = degree)
Ph.D.
Note (type = bibliography)
Includes bibliographical references
Subject (authority = ETD-LCSH)
Topic
Lipids--Oxidation
Note (type = statement of responsibility)
by Jia Xie
RelatedItem (type = host)
TitleInfo
Title
Graduate School - New Brunswick Electronic Theses and Dissertations
Identifier (type = local)
rucore19991600001
Location
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NjNbRU
Identifier (type = doi)
doi:10.7282/T3959KDF
Genre (authority = ExL-Esploro)
ETD doctoral
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Rights

RightsDeclaration (ID = rulibRdec0006)
The author owns the copyright to this work.
RightsHolder (type = personal)
Name
FamilyName
Xie
GivenName
Jia
Role
Copyright Holder
RightsEvent
Type
Permission or license
DateTime (encoding = w3cdtf); (qualifier = exact); (point = start)
2015-04-20 12:59:15
AssociatedEntity
Name
Jia Xie
Role
Copyright holder
Affiliation
Rutgers University. Graduate School - New Brunswick
AssociatedObject
Type
License
Name
Author Agreement License
Detail
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.
RightsEvent
DateTime (encoding = w3cdtf); (qualifier = exact); (point = start)
2015-05-31
DateTime (encoding = w3cdtf); (qualifier = exact); (point = end)
2015-11-30
Type
Embargo
Detail
Access to this PDF has been restricted at the author's request. It will be publicly available after November 30th, 2015.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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RULTechMD (ID = TECHNICAL1)
ContentModel
ETD
OperatingSystem (VERSION = 5.1)
windows xp
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