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Appl Environ Microbiol. 1976 Sep;32(3):400-4.

Defined conditions for synthesis of Bacillus cereus enterotoxin by fermenter-grown cultures.


A strain of Bacillus cereus produced high levels of enterotoxin when grown in a semidefined medium in a laboratory scale fermenter. The optimum conditions for enterotoxin synthesis by cultures grown in this medium, which contained Casamino Acids and yeast extract, were found to be: inoculation of vigorously gorwing culture at the 1% level, addition of glucose at a concentration of 1%, control of culture pH at 8.0, incubation at 32 degrees C, use of a moderate stirring rate, and addition of air at low flow rates to minimize foaming. The enterotoxin yield in fermenter-grown cultures was approximately 20 to 50 times higher than the yield obtained in shake flask cultures.

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