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KMID : 0380619820140010011
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Korean Journal of Food Science and Technology
1982 Volume.14 No. 1 p.11 ~ p.15
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Growth Rate of Bacillus cereus and Heat Resistance of its Spores
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Abstract
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The growth rate and heat resistance of two types of Bacillus cereus isolated from cooked rice were observed. The FB-1 strain showed positive to haemolysis and negative to starch hydrolysis, but FB-2 strain positive to both reaction.
The cell number of B. cereus FB-1 reached to more than 107 cells/㎖ within 6 to 12 hours at 25∼35℃ when cultured on the medium of cooked rice homogenate (cooked rice 30g-phosphate buffer solution 80 ㎖), but the numbers at its maximum growth were only 10⁴∼l0^6 cells/㎖ at 45∼55℃. The specific growth rate of FB-1 strain were 0.82hr^(-1) at 20℃, 1.76hr^(-1) at 30℃, 2.21hr^(-1) at 35℃ and 1.84hr^(-1) at 40℃, respectively. D-values of FB-1 and FB-2 spores at 70∼100℃ were in the range from 18 to 3.1 min and 23.5 to 3.7 min, respectively.
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