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# The impact of modified atmosphere packaging and irradiation on the survival and pathogenicity of Listeria monocytogenes and the design of a mathematical model

 dc.contributor.author Chung-Lewis, Mei en_US dc.date.accessioned 2007-05-15T19:07:19Z dc.date.available 2007-05-15T19:07:19Z dc.date.issued 1998-04-01T00:00:00Z en_US dc.identifier.uri http://hdl.handle.net/1993/1258 dc.description.abstract The survival of Listeria monocytogenes in packaged, ground containing either CO$\sb2$ (15% or 30%) or air was examined during storage at 5 or 11$\sp\circ$C. Survival was evaluated when electron beam radiation (1.75 kGy) was used as part of a combination treatment. The mathematical model $\rm S\over{S\sb0}$ = exp ($\mu\sb0\sp*$ (1 $-$ exp ($-$Dt)), is derived from the experimental data generated by this study. Fat (protein) content, storage temperature, and atmospheric conditions were the parameters which were applied to derive this equation. The growth ratio can be used to predict the effectiveness of these parameters on the survival of the organism. For example, this equation demonstrates that the number of listeriae increased as the level of CO$\sb2$ decreased in both 5 and 11$\sp\circ$C. By manipulating the proportionality constant, $\mu\sb0\sp*$, and using the exponential data points, a best fit line can be produced to the one that is very similar to the growth curve of an organism The goodness of fit of this line can demonstrate the effect of various treatment protocols to the survival of the organism. (Abstract shortened by UMI.) en_US dc.format.extent 7332259 bytes dc.format.extent 184 bytes dc.format.mimetype application/pdf dc.format.mimetype text/plain dc.language en en_US dc.language.iso en_US dc.rights info:eu-repo/semantics/openAccess dc.title The impact of modified atmosphere packaging and irradiation on the survival and pathogenicity of Listeria monocytogenes and the design of a mathematical model en_US dc.type info:eu-repo/semantics/masterThesis dc.type master thesis en_US dc.degree.discipline Food Science en_US dc.degree.level Master of Science (M.Sc.) en_US
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