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Applied and Environmental Microbiology, July 2003, p. 3945-3951, Vol. 69, No. 7
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.7.3945-3951.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Salmonella enterica Serovar Typhimurium and Listeria monocytogenes Acid Tolerance Response Induced by Organic Acids at 20°C: Optimization and Modeling

E. J. Greenacre,* T. F. Brocklehurst, C. R. Waspe, D. R. Wilson, and P. D. G. Wilson

Institute of Food Research, Norwich NR4 7UA, United Kingdom

Received 8 November 2002/ Accepted 7 February 2003

An acid tolerance response (ATR) has been demonstrated in Listeria monocytogenes and Salmonella enterica serovar Typhimurium in response to low pH poised (i.e., adapted) with acetic or lactic acids at 20°C and modeled by using dynamic differential equations. The ATR was not immediate or prolonged, and optimization occurred after exposure of L. monocytogenes for 3 h at pH 5.5 poised with acetic acid and for 2 h at pH 5.5 poised with lactic acid and after exposure of S. enterica serovar Typhimurium for 2 h at pH 5.5 poised with acetic acid and for 3 h at pH 5.5 poised with lactic acid. An objective mechanistic analysis of the acid inactivation data yielded estimates of the duration of the shoulder (ts), the log-linear decline (kmax), and the magnitude of a critical component (C). The magnitude of kmax gave the best agreement with estimates of conditions for optimum ATR induction made from the raw data.

* Corresponding author. Mailing address: Institute of Food Research, Norwich Research Park, Colney, Norwich NR4 7UA, United Kingdom. Phone: 44(0)1603-255216. Fax: 44(0)1603-507723. E-mail: elizabeth.greenacre{at}bbsrc.ac.uk.

Applied and Environmental Microbiology, July 2003, p. 3945-3951, Vol. 69, No. 7
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.7.3945-3951.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

  • Coroller, L., Leguerinel, I., Mettler, E., Savy, N., Mafart, P. (2006). General model, based on two mixed weibull distributions of bacterial resistance, for describing various shapes of inactivation curves.. Appl. Environ. Microbiol. 72: 6493-6502 [Abstract] [Full Text]  
  • Greenacre, E. J., Lucchini, S., Hinton, J. C. D., Brocklehurst, T. F. (2006). The Lactic Acid-Induced Acid Tolerance Response in Salmonella enterica Serovar Typhimurium Induces Sensitivity to Hydrogen Peroxide. Appl. Environ. Microbiol. 72: 5623-5625 [Abstract] [Full Text]  


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