Abstract
The relationship between membrane permeabilization and loss of viability by chilling depending on the chilling rate was investigated in two bacterial models: one Gram-positive bacterium, Lactobacillus plantarum, and one Gram-negative bacterium, Escherichia coli. Cells were cold shocked slowly (2°C/min) or rapidly (2,000°C/min) from physiological temperature to 0°C and maintained at this temperature for up to 1 week. Loss of membrane integrity was assessed by the uptake of the fluorescent dye propidium iodide (PI). Cell death was found to be strongly dependent on the rate of temperature downshift to 0°C. Prolonged incubation of cells after the chilling emphasized the effect of treatment on the cells, as the amount of cell death increased with the length of exposure to low temperature, particularly when cells were rapidly chilled. More than 5 and 3-log reductions in cell population were obtained with L. plantarum and E. coli after the rapid cold shock followed by 7-day storage, respectively. A correlation between cell inactivation and membrane permeabilization was demonstrated with both bacterial strains. Thus, loss of membrane integrity due to the chilling treatments was directly involved in the inactivation of vegetative bacterial cells.
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This work was supported in part by the Agence Universitaire de la Francophonie (AUF), the Vietnamese and French Ministries of Education and Training and the Bourgogne region.
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Communicated by Erko Stackebrandt.
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Cao-Hoang, L., Dumont, F., Marechal, P.A. et al. Inactivation of Escherichia coli and Lactobacillus plantarum in relation to membrane permeabilization due to rapid chilling followed by cold storage. Arch Microbiol 192, 299–305 (2010). https://doi.org/10.1007/s00203-010-0555-y
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DOI: https://doi.org/10.1007/s00203-010-0555-y