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Appl Environ Microbiol, February 1998, p. 509-514, Vol. 64, No. 2
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Effects of High Pressure on Inactivation Kinetics and Events Related to Proton Efflux in Lactobacillus plantarum

Patrick C. Wouters,1 Erwin Glaasker,2 and Jan P. P. M. Smelt1,*

Unilever Research Laboratorium Vlaardingen, 3130 AC Vlaardingen,1 and Department of Microbiology, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Haren,2 The Netherlands

Received 17 July 1997/Accepted 17 November 1997

Knowledge of the mechanism of pressure-induced inactivation of microorganisms could be helpful in defining an effective, relatively mild pressure treatment as a means of decontamination, especially in combination with other physical treatments or antimicrobial agents. We have studied the effect of high pressure on Lactobacillus plantarum grown at pH 5.0 and 7.0. The classical inactivation kinetics were compared with a number of events related to the acid-base physiology of the cell, i.e., activity of F0F1 ATPase, intracellular pH, acid efflux, and intracellular ATP pool. Cells grown at pH 5.0 were more resistant to pressures of 250 MPa than were cells grown at pH 7.0. This difference in resistance may be explained by a higher F0F1 ATPase activity, better ability to maintain a Delta pH, or a higher acid efflux of the cells grown at pH 5.0. After pressure treatment at 250 MPa, the F0F1 ATPase activity was decreased, the ability to maintain a Delta pH was reduced, and the acid efflux was impaired. The ATP pool increased initially after mild pressure treatment and finally decreased after prolonged treatment. The observations on acid efflux and the ATP pool suggest that the glycolysis is affected by high pressure later than is the F0F1 ATPase activity. Although functions related to the membrane-bound ATPase activity were impaired, no morphological changes of the membrane could be observed.

* Corresponding author. Mailing address: Unilever Research Laboratorium Vlaardingen, Olivier van Noortlaan 120, 3130 AC Vlaardingen, The Netherlands. Phone: 31-10-4605578. Fax: 31-10-4605188. E-mail: Jan.Smelt{at}Unilever.com.




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