The Effect of Sodium Chloride on Heat Resistance and Recovery of Heated Spores of Bacillus stearothermophilus |
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| Authors: | A M Cook R J Gilbert |
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| Institution: | The School of Pharmacy, University of London, Brunswick Square, London, W.C. 1, England |
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| Abstract: | Increasing concentrations (2, 4 and 8% w/v) of sodium chloride in the heating medium progressively reduced the heat resistance of spores of Bacillus stearothermophilus. Storage at 4° in water or in sodium chloride solutions had little effect on viable counts of unheated spores, but with the increase in sodium chloride concentration there was a reduction in the heat activation effect and a small decrease in heat resistance of the spores. Increasing the severity of heat treatment rendered spores increasingly sensitive to sodium chloride in the plating medium. |
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