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Applied and Environmental Microbiology, April 2009, p. 2590-2597, Vol. 75, No. 8
0099-2240/09/$08.00+0     doi:10.1128/AEM.02167-08
Copyright © 2009, American Society for Microbiology. All Rights Reserved.

Dynamic Model of Heat Inactivation Kinetics for Bacterial Adaptation{triangledown}

Maria G. Corradini1* and Micha Peleg2

Instituto de Tecnología, Facultad de Ingeniería y Ciencias Exactas, Universidad Argentina de la Empresa, Ciudad de Buenos Aires, Argentina,1 Department of Food Science, 228 Chenoweth Lab, 100 Holdsworth Way, University of Massachusetts, Amherst, Massachusetts 010032

Received 18 September 2008/ Accepted 2 February 2009

The Weibullian-log logistic (WeLL) inactivation model was modified to account for heat adaptation by introducing a logistic adaptation factor, which rendered its "rate parameter" a function of both temperature and heating rate. The resulting model is consistent with the observation that adaptation is primarily noticeable in slow heat processes in which the cells are exposed to sublethal temperatures for a sufficiently long time. Dynamic survival patterns generated with the proposed model were in general agreement with those of Escherichia coli and Listeria monocytogenes as reported in the literature. Although the modified model's rate equation has a cumbersome appearance, especially for thermal processes having a variable heating rate, it can be solved numerically with commercial mathematical software. The dynamic model has five survival/adaptation parameters whose determination will require a large experimental database. However, with assumed or estimated parameter values, the model can simulate survival patterns of adapting pathogens in cooked foods that can be used in risk assessment and the establishment of safe preparation conditions.

* Corresponding author. Mailing address: Instituto de Tecnología, Facultad de Ingeniería y Ciencias Exactas, Universidad Argentina de la Empresa, Ciudad de Buenos Aires, Argentina. Phone: 54-11-4801-7494. Fax: 54-11-4000-7600, ext. 7498. E-mail: mariagcorradini{at}gmail.com

{triangledown} Published ahead of print on 6 February 2009.

Applied and Environmental Microbiology, April 2009, p. 2590-2597, Vol. 75, No. 8
0099-2240/09/$08.00+0     doi:10.1128/AEM.02167-08
Copyright © 2009, American Society for Microbiology. All Rights Reserved.





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