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The profile of the survival curves, at different heating temperatures, of B. coagulans STCC 4522 sporulated at 52(deg)C has been studied, focusing on the early moments of treatment. A highly heat-sensitive spore subpopulation that includes more than 90% of the total spore population has been found. This heat-sensitive spore fraction was inactivated after 2 s of treatment at 111(deg)C. Its heat resistance was as much as 200-fold lower than that of the heat-resistant spore fraction (D(inf111(deg)C) of 0.01 min for the heat-sensitive spore fraction compared with D(inf111(deg)C) of 2 min for the heat-resistant fraction). The shape of the survival curve at 108.5(deg)C was modified after a sublethal heat shock at 80(deg)C for 3.5 h, resulting in a straight-line survival curve. The temperature of treatment also influenced the shape of the survival curves. The conversion of the highly heat-sensitive spore subpopulation to a more heat-stable form is discussed.

Occurrence of a Highly Heat-Sensitive Spore Subpopulation of Bacillus coagulans STCC 4522 and Its Conversion to a More Heat-Stable Form