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Distributions and reactivities of phenolic antioxidants in various aggregation systems

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Title
Distributions and reactivities of phenolic antioxidants in various aggregation systems
Name (type = personal)
NamePart (type = family)
Gu
NamePart (type = given)
Qing
NamePart (type = date)
1983-
DisplayForm
Qing Gu
Role
RoleTerm (authority = RULIB)
author
Name (type = personal)
NamePart (type = family)
Romsted
NamePart (type = given)
Laurence Stuart
DisplayForm
Laurence Stuart Romsted
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
chair
Name (type = personal)
NamePart (type = family)
Uhrich
NamePart (type = given)
Kathryn
DisplayForm
Kathryn Uhrich
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = personal)
NamePart (type = family)
Warmuth
NamePart (type = given)
Ralf
DisplayForm
Ralf Warmuth
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = personal)
NamePart (type = family)
HUANG
NamePart (type = given)
QINGRONG
DisplayForm
QINGRONG HUANG
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 (encoding = w3cdtf); (qualifier = exact)
2015
DateOther (qualifier = exact); (type = degree)
2015-10
CopyrightDate (encoding = w3cdtf); (qualifier = exact)
2015
Place
PlaceTerm (type = code)
xx
Language
LanguageTerm (authority = ISO639-2b); (type = code)
eng
Abstract (type = abstract)
Selecting the best antioxidant, AO, for a particular food application is still a major problem in food science because AO e ciencies are determined by a variety of factors. One major di culty in establishing a scale of AO e ciencies has been the lack of reliable methods for determining AO distributions between the di erent regions of aggregated systems, which arises from the physical impossibility of separating the interfacial region from the aqueous or oil regions. We have developed a on-invasive" approach to estimate AO distributions in various aggregated systems. The observed rate constant, kobs, for the reaction of a chemical probe, 4-n-hexadecylbenzenediazonium ion (16-ArN+2), that is located in the interfacial region of an aggregation system with an AO is measured by a chemical derivatization method or directly by UV-Vis spectroscopy depending upon the system turbidity. The kinetic data is interpreted by using a well established pseudophase kinetic model that was originally developed for treating chemical reactivity in micelles and microemulsions, and in this thesis we demonstrate that the model can be applied to nonionic emulsions, ionic emulsions, and vesicles. Chapter 1 is a general introduction on pertinent background information including dynamic equilibrium in surfactant aggregates, basic assumptions of the pseusophase kinetic model and logic of the chemical trapping method, and e ect of AO distributions on AO e ciency. Chapter 2 describes the application of the pseudophase kinetic model to cationic and anionic emulsions in the absence and presence of added salt to obtain estimates of the partition constants of t-butylhydroquinone, TBHQ, between the oil and interfacial region, PIO, and the aqueous and interfacial region, PIW, and the second-order interfacial rate constant, kI, that is independent of AO distributions. Chapter 3 reports measurements of kobs for 16-ArN+2 reacting with TBHQ in C12E6 nonionic emulsions of constant composition but di erent droplet size distributions together with hydration number estimates for C12E6. The results support the pseudophase model assumptiont that rate constants for reactions in emulsions are insensitive to changes in droplet size and that the medium properties of the interfacial region are virtually constant. Chapter 4 demonstrates that the AO reactivity of a homologous series of gallate esters as characterized by the observed rate constant, kobs, for their reactions with 16-ArN+2 plateaus in vesicular solutions once the AOs are fully associated with the vesicles. This plateau di ers from the cuto e ect" observed in oil-inwater emulsions, the AO activity increases with the alkyl chain length of AO and reaches a maximum at an intermediate chain length, after which further increase in AO chain length results in a decrease in activity.
Subject (authority = RUETD)
Topic
Chemistry and Chemical Biology
RelatedItem (type = host)
TitleInfo
Title
Rutgers University Electronic Theses and Dissertations
Identifier (type = RULIB)
ETD
Identifier
ETD_6631
PhysicalDescription
Form (authority = gmd)
electronic resource
InternetMediaType
application/pdf
InternetMediaType
text/xml
Extent
1 online resource (xvi, 144 p. : ill.)
Note (type = degree)
Ph.D.
Note (type = bibliography)
Includes bibliographical references
Subject (authority = ETD-LCSH)
Topic
Reactivity (Chemistry)
Subject (authority = ETD-LCSH)
Topic
Antioxidants
Note (type = statement of responsibility)
by Qing Gu
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/T3RN39T3
Genre (authority = ExL-Esploro)
ETD doctoral
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Rights

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The author owns the copyright to this work.
RightsHolder (type = personal)
Name
FamilyName
Gu
GivenName
Qing
Role
Copyright Holder
RightsEvent
Type
Permission or license
DateTime (encoding = w3cdtf); (qualifier = exact); (point = start)
2015-07-23 08:48:35
AssociatedEntity
Name
Qing Gu
Role
Copyright holder
Affiliation
Rutgers University. Graduate School - New Brunswick
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License
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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)
2015-10-31
DateTime (encoding = w3cdtf); (qualifier = exact); (point = end)
2016-05-01
Type
Embargo
Detail
Access to this PDF has been restricted at the author's request. It will be publicly available after May 1st, 2016.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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