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UV-C inactivation kinetics modelling of dairy-associated listeria monocytogenes strains and the effect of suspended solids on fluence response of listeria monocytogenes in milk using collimated beam UC-C device

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Title: UV-C inactivation kinetics modelling of dairy-associated listeria monocytogenes strains and the effect of suspended solids on fluence response of listeria monocytogenes in milk using collimated beam UC-C device
Author: Handy, Stephanie
Department: Department of Food Science
Program: Food Science
Advisor: LaPointe, Gisèle
Abstract: There is a disagreement on the UV C fluence required for microbial inactivation due to various understanding of UV-C fluence and its measurement methods. This study determined the UV-C fluences required for dairy-associated Listeria monocytogenes strains inactivation using a collimated beam device. In PBS, a UV-C fluence of 10 mJ/cm2 was sufficient to inactivate 5 logs of L. monocytogenes. Milk fat and protein concentration, fat globule and casein micelle particle sizes strongly correlated with observed UV C absorption and scattering of the milk. These optical properties significantly affected the inactivation of L. monocytogenes. Taking into consideration the UV C absorption and reduced scattering coefficients of milk in the UV C fluence calculation, inactivation similar to that observed in PBS at various UV C doses could be achieved in goat and cow milk at various fat levels. This study demonstrated that the inclusion of the milk optical properties is critical for accurate UV C fluence calculations.
URI: https://hdl.handle.net/10214/27034
Date: 2022-06
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