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Applied and Environmental Microbiology, May 2003, p. 3015-3019, Vol. 69, No. 5
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.5.3015-3019.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Unexpected Thermal Destruction of Dried, Glass Bead-Immobilized Microorganisms as a Function of Water Activity

C. Laroche and P. Gervais*

Laboratoire de Génie des Procédés Alimentaires et Biotechnologiques, Ecole Nationale Supérieure de Biologie Appliquée à la Nutrition et à l-Alimentation, 21000 Dijon, France

Received 26 August 2002/ Accepted 13 February 2003

To help us understand the factors and mechanisms implicated in the death of microorganisms or their resistance to temperature in a low water activity environment, microorganisms were dried on the surface of glass beads before being subjected to high temperatures for a short period followed by rapid cooling. Two microorganisms were studied: the yeast Saccharomyces cerevisiae and the bacterium Lactobacillus plantarum. Experiments were carried out at 150, 200, and 250°C, with four durations of heat treatment and seven levels of initial water activity between 0.10 and 0.70. We observed an unexpected range of water activity, between 0.30 and 0.50, at which microorganisms were more resistant to the various treatments, with maximal viability at 0.35 for L. plantarum and 0.40 for S. cerevisiae.

* Corresponding author. Mailing address: Laboratoire de Génie des Procédés Alimentaires et Biotechnologiques, ENSBANA, 1 Esplanade Erasme, 21000 Dijon, France. Phone: 33(0)3-80-39-66-54. Fax: 33(0)3-80-39-66-11. E-mail: gervais{at}u-bourgogne.fr.

Applied and Environmental Microbiology, May 2003, p. 3015-3019, Vol. 69, No. 5
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.5.3015-3019.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.





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