Journal
INTERNATIONAL JOURNAL OF FOOD MICROBIOLOGY
Volume 146, Issue 1, Pages 57-62Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijfoodmicro.2011.01.042
Keywords
Heat resistance; Sporulation; Psychotrophic Bacillus cereus; Spore-forming bacteria
Categories
Funding
- French National Research Agency (ANR) [ANR-07-PNRA-027-07]
- industrial association BBA (Bretagne Biotechnologies Alimentaires)
- French National Association of Technical Research (ANRT)
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While bacterial spores are mostly produced in a continuous process, this study reports a two-step sporulation methodology. Even though spore heat resistance of numerous spore-forming bacteria is known to be dependent on sporulation conditions, this approach enables the distinction between the vegetative cell growth phase in nutrient broth and the sporulation phase in specific buffer. This study aims at investigating whether the conditions of growth of the vegetative cells, prior to sporulation, could affect spore heat resistance. For that purpose, wet-heat resistance of Bacillus weihenstephanensis KBAB4 spores, produced via a two-step sporulation process, was determined from vegetative cells harvested at four different stages of the growth kinetics, i.e. early exponential phase, late exponential phase, transition phase or early stationary phase. To assess the impact of the temperature on spore heat resistance, sporulation was performed at 10 degrees C, 20 degrees C and 30 degrees C from cells grown during a continuous or a discontinuous temperature process, differentiating or not the growth and sporulation temperatures. Induction of sporulation seems possible for a large range of growth stages. Final spore concentration was not significantly affected by the vegetative cell growth stage while it was by the temperature during growing and sporulation steps. The sporulation temperature influences the heat resistance of B. weihenstephanensis KBAB4 spores much more than growth temperature prior to sporulation. Spores produced at 10 degrees C were up to 3 times less heat resistant than spores produced at 30 degrees C. (C) 2011 Elsevier BM. All rights reserved.
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