Barotolerance is inducible by preincubation under hydrostatic pressure, cold-, osmotic- and acid-stress conditions in Lactobacillus sanfranciscensis DSM 20451T |
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Authors: | Scheyhing C H Hörmann S Ehrmann M A Vogel R F |
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Institution: | Lehrstuhl für Technische Mikrobiologie, Freising, Germany. |
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Abstract: | AIMS: This study addresses the inducibility of barotolerance by preincubation of Lactobacillus sanfranciscensis DSM 20451T under various sublethal stress conditions. METHODS AND RESULTS: Stress conditions which reduce the growth rate of L. sanfranciscensis DSM 20451T to 10% of its maximum were determined. These conditions were met at 43, 12.5 degrees C, a pH value of 3.7, 1.9% NaCl, or 80 MPa respectively. In contrast to heat preincubation, other prestresses, including salt, cold and pressure led to an increase of barotolerance by hydrostatic pressure of 300 MPa for 30 min. Stationary-phase cells also showed an increased barotolerance. Sublethal pressure leads to enhanced heat tolerance. CONCLUSIONS: Stress response to salt, low temperature and acidic pH as well as starvation overlap with that one to high pressure by inducing barotolerance. SIGNIFICANCE AND IMPACT OF THE STUDY: Inactivation of bacteria by high pressure treatment is influenced by their history which modulates barotolerance. Mechanisms of barotolerance appear different from heat shock defence. |
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Keywords: | barotolerance cross protection food microbiology hydrostatic pressure treatment Lactobacillus sanfranciscensis preservation |
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