Abstract:
:The purpose of this study was to quantify the lag time of re-growth of heated spores of Bacillus cereus as a function of the conditions of the heat treatment: temperature, duration and pH of the recovery medium. For a given heating temperature, curves plotting lag times versus time of heating show more or less complex patterns. However, under a heating time corresponding to a decrease of 2 decimal logarithms of the surviving populations of spores, a linear relationship between the lag time of growth and the time of the previous heat treatment can be observed. The slope of this linear relationship followed itself a Bigelow type linear relationship, the slope of which yielded a zeta-value very close to the observed conventional z-value. It was then concluded that the slope of the regrowth lag time versus the heating time followed a linear relationship with the sterilisation value reached in the course of the previous heat treatment. A sharp effect of the pH of the medium which could be described by a simple "secondary" model was observed. As expected, the observed intercept of the linear relationship between lag time and heating time (lag without previous heating) was dependent on only the pH of the medium and not on the heating temperature.
journal_name
Int J Food Microbioljournal_title
International journal of food microbiologyauthors
Gaillard S,Leguérinel I,Savy N,Mafart Pdoi
10.1016/j.ijfoodmicro.2005.04.009subject
Has Abstractpub_date
2005-11-15 00:00:00pages
53-8issue
1eissn
0168-1605issn
1879-3460pii
S0168-1605(05)00312-0journal_volume
105pub_type
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