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Understanding and managing the risk from Salmonella on cucumbers
Descriptive
TitleInfo
Title
Understanding and managing the risk from Salmonella on cucumbers
Name
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Jung
NamePart
(type = given)
Jiin
NamePart
(type = date)
1981-
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Jiin Jung
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author
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Schaffner
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Donald W.
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Donald W. Schaffner
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Advisory Committee
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chair
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Karwe
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Mukund V.
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Mukund V. Karwe
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Advisory Committee
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(authority = RULIB)
internal member
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(type = family)
Matthews
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(type = given)
Karl R.
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Karl R. Matthews
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Advisory Committee
Role
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(authority = RULIB)
internal member
Name
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(type = family)
Strawn
NamePart
(type = given)
Laura K.
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Laura K. Strawn
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Advisory Committee
Role
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(authority = RULIB)
outside member
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Rutgers University
Role
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(authority = RULIB)
degree grantor
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School of Graduate Studies
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school
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Text
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theses
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2018
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2018-05
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2018
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xx
Language
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eng
Abstract
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Recent multistate outbreaks of salmonellosis directly associated with fresh cucumbers highlight the importance of understanding the factors that may influence or contribute to the risk of Salmonella contamination on cucumbers. The studies in this dissertation increase our limited knowledge of select factors on Salmonella behavior in cucumbers. The results in Chapter 2 show that significant bacterial transfer from cucumber skin to edible flesh portion and peeler occurred during peeling no matter what microorganisms exist on the surface of cucumber. There was no significant difference between transfer of S. Newport and E. aerogenes, indicating that E. aerogenes B199A could be used as surrogate for S. Newport in cross-contamination studies regarding cucumbers. The main finding from Chapter 3 was that curli and cellulose-producing S. Newport wild type showed better attachment to the surface of cucumber compared to non-producing mutant strains, but curli and cellulose did not have a significant influence on transfer of S. Newport to edible flesh portion of cucumber during peeling. These suggest that bacterial cell surface components including curli, cellulose, flagella, and capsular polysaccharides are all involved in complex interaction of S. Newport with cucumber, but that other, more important mechanisms influence Salmonella attachment and transfer to cucumbers. Chapter 4 shows that Salmonella are able to survive on the surface of cucumbers stored at 7 and 21 °C for up to 7 days, whether the cucumber was waxed or un-waxed. Significant transfer of Salmonella from inoculated cucumbers to brushes and un-inoculated cucumbers was found during cucumber waxing. Salmonella remaining on the contaminated cucumbers after waxing survived up to 7 days, and Salmonella showed better survival on the cucumbers treated with a petroleum-based wax. These results suggest that survival and transfer of Salmonella vary depending on the type of wax coatings. The models developed in Chapter 5 predict the growth and survival of Salmonella on whole and cut cucumbers as a function of temperature and RH. These findings should be useful for future microbial risk assessments and predictions of Salmonella behavior in cucumbers to manage the risk of Salmonella with respect to cucumbers.
Subject
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Topic
Food Science
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Title
Rutgers University Electronic Theses and Dissertations
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ETD_8874
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electronic resource
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application/pdf
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text/xml
Extent
1 online resource (xiii, 102 p. : ill.)
Note
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Ph.D.
Note
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Includes bibliographical references
Subject
(authority = ETD-LCSH)
Topic
Salmonella infections--Prevention
Subject
(authority = ETD-LCSH)
Topic
Salmonella food poisoning
Subject
(authority = ETD-LCSH)
Topic
Cucumbers
Note
(type = statement of responsibility)
by Jiin Jung
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Title
School of Graduate Studies Electronic Theses and Dissertations
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rucore10001600001
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doi:10.7282/T3PV6PT7
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ETD doctoral
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Rights
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The author owns the copyright to this work.
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Name
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Jung
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Jiin
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Permission or license
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2018-04-12 18:55:19
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Jiin Jung
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Rutgers University. School of Graduate Studies
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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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2018-05-31
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2019-05-31
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Detail
Access to this PDF has been restricted at the author's request. It will be publicly available after May 31st, 2019.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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2018-04-12T22:53:22
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