Effect of heat treatment, irradiation and storage conditions on the survival, growth and virulence of heat-shocked Yersinia enterocolitica in ground pork

dc.contributor.advisor Elsa A. Murano
dc.contributor.advisor Dennis G. Olson
dc.contributor.author Shenoy, Kalpana
dc.contributor.department Veterinary Microbiology and Preventive Medicine
dc.date 2018-08-23T06:01:19.000
dc.date.accessioned 2020-06-30T07:07:06Z
dc.date.available 2020-06-30T07:07:06Z
dc.date.copyright Sun Jan 01 00:00:00 UTC 1995
dc.date.issued 1995
dc.description.abstract <p>The heat shock response and thermotolerance of Yersinia enterocolitica in BHI broth and ground pork was studied. Further, the survival and growth of the heat-shocked cells following heat treatment at 55° C and stored at 4 or 25° C under air, vacuum, or modified atmosphere was also examined. Lastly, the irradiation sensitivity of the heat-shocked cells when suspended in pork and packaged either under air or vacuum was determined. As part of the research, virulence of the survivors was examined following heat treatment or irradiation;Exposure of Y. enterocolitica to 45° C for 60 mins. in BHI broth resulted in the heat shock response with increased thermotolerant cells. D[subscript]55 values for heat-shocked and nonheat-shocked controls in BHI broth were 7.7 and 2.0 mins. respectively. Similarly, the D[subscript]55 values in ground pork were 15.6 and 6.5 mins. respectively. Two heat shock proteins were isolated with molecular weights of 70.5 and 58.0 kDa. During storage, the heat-shocked Yersinia grew rapidly under both temperatures and all the atmospheres. There was no significant difference (p > 0.05) in growth rates between the heat-shocked and controls. The heat-shocked cells in ground pork did not exhibit increased resistance when irradiated either under air or vacuum. An average D value of 0.15 kGy was calculated for both the heat-shocked and control cells and under air or vacuum. The surviving cells showed virulent characteristics following either heat treatment or irradiation.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/10721/
dc.identifier.articleid 11720
dc.identifier.contextkey 6415887
dc.identifier.doi https://doi.org/10.31274/rtd-180813-11181
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/10721
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/63899
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/10721/r_9531787.pdf|||Fri Jan 14 18:27:01 UTC 2022
dc.subject.disciplines Agriculture
dc.subject.disciplines Food Microbiology
dc.subject.disciplines Food Science
dc.subject.disciplines Microbiology
dc.subject.keywords Microbiology
dc.subject.keywords immunology and preventive medicine
dc.subject.keywords Microbiology
dc.title Effect of heat treatment, irradiation and storage conditions on the survival, growth and virulence of heat-shocked Yersinia enterocolitica in ground pork
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication 16f8e472-b1cd-4d8f-b016-09e96dbc4d83
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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