Potato puree and penne pasta were inoculated with cereulide producing B. cereus 5964a and B. cereus NS117. Static incubation at 28°C proved these two foods to be a better substrate for higher cereulide production (4,080 ng/g in puree and 3,200 ng/g in penne were produced by B. cereus 5964a during 48 h of incubation) compared with boiled rice (2,000 ng/g). This difference occurred despite B. cereus counts of more than 108 CFU/g in all three products. Aeration of cultures had a negative effect on cereulide production, causing concentrations more than 10-fold lower than in some statically incubated samples. Cereulide production remained undetectable in shaken milk, whereas it reached 1,140 ng/ml in statically incubated milk. At 12 and 22°C, presence of background flora was also a determinative factor. A total B. cereus count of more than 106 CFU/ml did not necessarily lead to uniform cereulide production and was also dependent on the B. cereus strain involved. In this study, we confirm that a number of factors play a crucial role in the determination of the extent to which, if at all, cereulide will be produced. Among those, type of the food, temperature, pH, and whether additional aeration (via incubation on an orbital shaker) is induced had an important role. An important effect was also induced by the cereulide-producing strain involved.
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Research Article|
April 01 2006
Influence of Type of Food on the Kinetics and Overall Production of Bacillus cereus Emetic Toxin
ANDREJA RAJKOVIC;
ANDREJA RAJKOVIC
1Laboratory for Food Microbiology and Food Preservation, Department for Food Safety and Food Quality, Faculty of Bioengineering Sciences, Ghent University, Coupure links 653, B-9000 Ghent, Belgium
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MIEKE UYTTENDAELE;
MIEKE UYTTENDAELE
*
1Laboratory for Food Microbiology and Food Preservation, Department for Food Safety and Food Quality, Faculty of Bioengineering Sciences, Ghent University, Coupure links 653, B-9000 Ghent, Belgium
* Author for correspondence. Tel: +3292646178; Fax: +3292255510; E-mail: Mieke.Uyttendaele@UGent.be.
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SYLVIE-ANNE OMBREGT;
SYLVIE-ANNE OMBREGT
1Laboratory for Food Microbiology and Food Preservation, Department for Food Safety and Food Quality, Faculty of Bioengineering Sciences, Ghent University, Coupure links 653, B-9000 Ghent, Belgium
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ELINA JAASKELAINEN;
ELINA JAASKELAINEN
2Department of Applied Chemistry and Microbiology, University of Helsinki, Helsinki, P.O. Box 56, FIN-0014, Finland
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MIRJA SALKINOJA-SALONEN;
MIRJA SALKINOJA-SALONEN
2Department of Applied Chemistry and Microbiology, University of Helsinki, Helsinki, P.O. Box 56, FIN-0014, Finland
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JOHAN DEBEVERE
JOHAN DEBEVERE
1Laboratory for Food Microbiology and Food Preservation, Department for Food Safety and Food Quality, Faculty of Bioengineering Sciences, Ghent University, Coupure links 653, B-9000 Ghent, Belgium
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J Food Prot (2006) 69 (4): 847–852.
Article history
Received:
July 15 2005
Accepted:
October 20 2005
Citation
ANDREJA RAJKOVIC, MIEKE UYTTENDAELE, SYLVIE-ANNE OMBREGT, ELINA JAASKELAINEN, MIRJA SALKINOJA-SALONEN, JOHAN DEBEVERE; Influence of Type of Food on the Kinetics and Overall Production of Bacillus cereus Emetic Toxin. J Food Prot 1 April 2006; 69 (4): 847–852. doi: https://doi.org/10.4315/0362-028X-69.4.847
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