ISHS Acta Horticulturae 674: III International Symposium on Applications of Modelling as an Innovative Technology in the Agri-Food Chain; MODEL-IT
INFLUENCE OF STRESS AND GROWTH CONDITIONS ON INDIVIDUAL LAG TIME DISTRIBUTIONS OF LISTERIA MONOCYTOGENES |
| Authors: | L. Guillier, J.-C. Augustin |
| Keywords: | Predictive microbiology; stochastic modelling; lag time; variability; probability of growth |
| DOI: | 10.17660/ActaHortic.2005.674.2 |
| Abstract:
The effects of nine common food industry stresses on the individual lag time (lag) distribution of L. monocytogenes were determined. The distributions of lag obtained in a single re-growth condition revealed that there was a noticeable difference in response to the stresses encountered by the L. monocytogenes cells. The applied stresses led to significant changes in the shape, mean and variance of lag distributions (in a single re-growth condition). Then, the influence of re-growth conditions on lag distribution and on the probability to initiate growth were examined for L. monocytogenes cells previously subjected to a representative stress situation of the dairy processing. A linear relation was observed between means of lag and their standard deviation. A decrease in the probability of initiating growth for stressed cells was also observed as growth conditions became unfavourable. These results suggest that stress-induced variability may be important in determining the reliability of predictive microbiological models. | |
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