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KMID : 1007520080170040824
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Food Science and Biotechnology
2008 Volume.17 No. 4 p.824 ~ p.828
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Effect of Temperatures on the Enterotoxin Production of Bacillus cereus in Cereal Grains
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Park Young-Bae
Kim Jung-Beom
Jin Yong-Guo
Oh Deog-Hwan
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Abstract
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Effect of various temperatures on enterotoxin production of Bacillus cereus 4 different cereal grains (brown rice, glutinous rice, barley, and Job’s tear) was studied. When B. cereus was inoculated to 4 grains, no toxin was detected within 24 hr at 20 and 25℃ although the population reached approximately 8-10 log CFU/g. However, enterotoxin was detected in all samples above 30℃. When the temperature was increased to 35℃, toxin production was observed in the range of 6.11 and 6.26 log CFU/g on brown rice and glutinous rice, respectively. At 40℃, toxin production was detected after 6 hr with the lowest bacterial population of 5.32 and 5.04 log CFU/g, whereas enterotoxin was produced in the range of 6.86 and 7.77 log CFU/g on barley and Job’s tear at 40℃. Different types of food affected enterotoxin production of B. cereus. These results suggest that enterotoxin production was more significantly regulated in incubation temperatures than the number of B. cereus.
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KEYWORD
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Bacillus cereus, enterotoxin production, temperature, cereal grain
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