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Conditions influencing  Bacillus cereus  growth and cereulide production, such as temperature and pH, were evaluated at varying incubation periods. The growth and cereulide production at different temperatures and pH values ranging from 10 to 40   o  C and 5.0 to 8.5, respectively showed that the temperature from 20 to 30  o C and at pH from 6.0 to 7.0 gave the optimum growth and cereulide production by  B. cereus  SA105. pH below 6.0 resulted in reduced growth and cereulide production. Cereulide production increased along with the incubation period, and maximum cereulide titre (ng/mL) of 1219.1±8.90 was obtained after 6 days of incubation at 30  o C and pH 6.5 under static conditions. There was no quantifiable toxin at incubation temperatures of 10 and 40  o C by  B. cereus  SA105. This work further reveals that  B. cereus  growth and cereulide production was significantly affected by temperature and pH in relation to the incubation period. Furthermore, the findings of this study will serve as a means for reducing the diversity of emetic toxin-producing  B. cereus  population in food and food products, thus preventing food poisoning.

Evaluation of growth and cereulide production by Bacillus cereus isolated from cooked rice