Abstract
Spores of Bacillus subtilis SA22 harvested after 22 d incubation on nutrient agar at 30°C were more resistant to 0–04% peracetic acid at 20°C than spores harvested following 2 d incubation. Similarly, spores of B. subtilis globigii B17, harvested after 7 d incubation on a sporulation agar were up to 10 times less resistant to 0.04% peracetic acid at 20°C than spores harvested after 35 d incubation. An increase in resistance to heating at 100°C and to exposure to 17.7% hydrogen peroxide at 20°C occurred as the age of B. subtilis SA22 spores prior to harvesting increased, whereas differences in resistance were not observed with spores of B. subtilis globigii B17.
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