Model for Combined Effects of Temperature, pH and Water Activity on Thermal Inactivation of Bacillus cereus Spores |
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| Authors: | S. GAILLARD I. LEGUERINEL P. MAFART |
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| Affiliation: | The authors are affiliated with Laboratoire Universitaire de Microbiologie Appliquée de Quimper, Pôle Universitaire de Creach Gwen F29000 Quimper, France. |
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| Abstract: | Initially, the effect of water activity (aw) on heat resistance of Bacillus cereus spores (decimal reduction time) was investigated. A linear relationship was found between log D and 1-aw. The combined effects of temperature (85-105°C), pH (4.5-6.5) and water activity (0.80-1) were then studied. A four parameter model was fitted to the data. This model appeared to be parsimonious with each parameter having a biological significance. Interactions between factors were observed but they accounted for <2.4% of the total variation and they were not taken into account by the model. |
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| Keywords: | water activity heat resistance Bacillus cereus modeling |
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