The Production of Bacillus cereus Enterotoxins Is Influenced by Carbohydrate and Growth Rate

被引:0
作者
Ouassila Ouhib
Thierry Clavel
Philippe Schmitt
机构
[1] INRA,
[2] UMR A408,undefined
[3] Sécurité et Qualité des Produits d’Origine Végétale,undefined
[4] Université d’Avignon et des Pays de Vaucluse,undefined
[5] Université d’Avignon et des Pays de Vaucluse,undefined
[6] UMR A408,undefined
[7] Sécurité et Qualité des Produits d’Origine Végétale,undefined
[8] INRA,undefined
来源
Current Microbiology | 2006年 / 53卷
关键词
Fructose; Bacillus Cereus; Acetoin; Anaerobic Growth; Carbon Recovery;
D O I
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学科分类号
摘要
Enterotoxin production is a key factor in Bacillus cereus food poisoning. Herein, the effect of the growth rate (μ) on B. cereus toxin production when grown on sucrose was studied and the Hemolytic BL enterotoxin (HBL) and nonhemolytic enterotoxin (Nhe) production by B. cereus was compared according to carbohydrate at μ = 0.2 h−1. The anaerobic growth was carried out on continuous cultures in synthetic medium supplemented with glucose, fructose, sucrose, or an equimolar mixture of glucose and fructose. Concerning the HBL and Nhe enterotoxin production: (1) the highest enterotoxin production has occurred at μ = 0.2 h−1 when growing on sucrose; (2) HBL production was repressed when glucose was consumed and the presence of fructose (alone or in mixture) cancelled glucose catabolite repression; (3) the consumption of sucrose increased Nhe production, which was not affected by the catabolite repression. Furthermore, analysis of the fermentative metabolism showed that whatever the μ or the carbon source, B. cereus used the mixed acid fermentation to ferment the different carbohydrates. The enterotoxin productions by this strain at μ = 0.2 h−1 are highly influenced by the carbohydrates that do not involve any fermentative metabolism changes.
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页码:222 / 226
页数:4
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