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- W2044431804 abstract "The present work studies the effect of acid shock on cell viability of Bacillus cereus and Bacillus weihenstephanensis. Experiments were performed by means of flow cytometry (FCM) combined with fluorescent labelling. Propidium iodide, for membrane evaluation, and carboxyfluorescein diacetate, for esterase activity were used for differential staining of both strains. pH values of 3.4, 3.8 and 4.2 were selected on the basis of previous screening tests. FCM analysis showed to clearly discriminate between different populations, viable and damage cells, leading to successful assessment of acid shock effect on B. cereus and B. weihenstephanensis vegetative cell viability. Cellular viability decreased at lower pH values and longer exposure times, being B. weihenstephanensis more acid resistant than B. cereus. Reliability of FCM analysis for detection of B. cereus and B. weihenstephanensis vegetative cells was compared with classical viable plate count techniques (VPC). Although FCM and VPC data were not directly correlated and classical analytical methods show higher reliability, FCM analysis provides high-speed information at real time on damage at single cell level, whereas VPC only gives an indication of cells able to grow at a certain time. These data could help to establish more accurately the potential risk associated to foods or processing conditions where pH is involved, taking damage into consideration." @default.
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- W2044431804 date "2014-12-01" @default.
- W2044431804 modified "2023-10-01" @default.
- W2044431804 title "Assessment of the of acid shock effect on viability of Bacillus cereus and Bacillus weihenstephanensis using flow cytometry" @default.
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- W2044431804 doi "https://doi.org/10.1016/j.foodres.2014.09.029" @default.
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