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The efficacy of chitosan-based coating in reducing surface attached Salmonella on tomatoes

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TitleInfo
Title
The efficacy of chitosan-based coating in reducing surface attached Salmonella on tomatoes
Name (type = personal)
NamePart (type = family)
Lai
NamePart (type = given)
Yi-Chun
NamePart (type = date)
1988-
DisplayForm
Yi-Chun Lai
Role
RoleTerm (authority = RULIB)
author
Name (type = personal)
NamePart (type = family)
Matthews
NamePart (type = given)
Karl R.
DisplayForm
Karl R. Matthews
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
chair
Name (type = personal)
NamePart (type = family)
Schaffner
NamePart (type = given)
Donald W.
DisplayForm
Donald W. Schaffner
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = personal)
NamePart (type = family)
Chikindas
NamePart (type = given)
Michael L.
DisplayForm
Michael L. Chikindas
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
internal 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)
Recently, an increasing number of outbreaks related to produce consumption have been reported. Tomatoes are considered as one of the main produce consumed in the United States; approximately 14 million tons of tomatoes are produced every year. However, the microbial safety of raw tomatoes has been questioned following many outbreaks associated with eating tomatoes contaminated with human pathogens. The CDC reports that eating raw tomatoes caused at least 12 Salmonella multistate outbreaks from 1990-2009, and resulted in over 2,000 illnesses. Therefore, developing a novel and alternative method to improve the microbial safety and quality of raw tomatoes is necessary. In the U.S., post-harvest tomatoes are often washed in chlorinated water (50-150 ppm) to remove debris, soil and prevent cross-contamination, with an additional effect of lowering the microbial load on the tomatoes. However, previous studies showed that tomatoes washed with chlorinated water (320 ppm) failed to completely inactivate Salmonella. Chitosan is a non-toxic, bio-degradable and antimicrobial compound, which has been reported for its efficacy of extending the shelf-life and reducing the microbial decay of fresh produce. The objective of this study is to investigate the efficacy of chitosan-based coating against surface attached Salmonella and natural microbiota on fresh tomatoes. All tomatoes were inoculated with Salmonella. After drying, tomatoes were washed in 100 ppm chlorinated water for 90 s. Tomatoes were then dipped in either 0.2% or 1.0% chitosan solution for 90 s. Controls were only dipped in tap water. Change in population of Salmonella and total aerobic microbes (Aerobic Plate Count, APC) were evaluated at pre-determined times. Results showed that the population of Salmonella and total aerobic microbes with the treatment of 1.0% chitosan solution following 100 ppm chlorinated wash step provided immediate inactivation on day 0, compared to control. On day 1 and day 5 post-treatment, the population of Salmonella and total aerobic microbes on tomatoes both increased during the five days of storage, except on tomatoes treated with 1.0% chitosan solution following 100 ppm chlorine wash step. Future research should consider evaluating up to 4.0% chitosan solutions for controlling microbial growth and extending the shelf-life of tomatoes.
Subject (authority = RUETD)
Topic
Food Science
RelatedItem (type = host)
TitleInfo
Title
Rutgers University Electronic Theses and Dissertations
Identifier (type = RULIB)
ETD
Identifier
ETD_6241
PhysicalDescription
Form (authority = gmd)
electronic resource
InternetMediaType
application/pdf
InternetMediaType
text/xml
Extent
1 online resource (viii, 45 p. : ill.)
Note (type = degree)
M.S.
Note (type = bibliography)
Includes bibliographical references
Subject (authority = ETD-LCSH)
Topic
Salmonella
Subject (authority = ETD-LCSH)
Topic
Tomatoes
Subject (authority = ETD-LCSH)
Topic
Chitosan
Note (type = statement of responsibility)
by Yi-Chun Lai
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/T3SX6G2H
Genre (authority = ExL-Esploro)
ETD graduate
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Rights

RightsDeclaration (ID = rulibRdec0006)
The author owns the copyright to this work.
RightsHolder (type = personal)
Name
FamilyName
Lai
GivenName
Yi-Chun
Role
Copyright Holder
RightsEvent
Type
Permission or license
DateTime (encoding = w3cdtf); (qualifier = exact); (point = start)
2015-04-13 23:07:18
AssociatedEntity
Name
Yi-Chun Lai
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.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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Technical

RULTechMD (ID = TECHNICAL1)
ContentModel
ETD
OperatingSystem (VERSION = 5.1)
windows xp
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