Abstract:
:Salmonella enterica serovar Typhimurium was grown at salt concentrations ranging from 0.5 to 7.5% in minimal medium with and without added osmoprotectant and in a rich medium. In minimal medium, the cells showed an initial decline period, and consequently the definition of the lag time of the resultant log count curve was revised. The model of Baranyi and Roberts (Int. J. Food Microbiol. 23:277-294, 1994) was modified to take into account the initial decline period, based on the assumption that the log count curve of the total population was the sum of a dying and a surviving-then-growing subpopulation. The lag time was defined as the lag of the surviving subpopulation. It was modeled by means of a parameter quantifying the biochemical work the surviving cells carry out during this phase, the "work to be done." The logarithms of the maximum specific growth rates as a function of the water activity in the three media differed only by additive constants, which gave a theoretical basis for bias factors characterizing the relationships between different media. Models for the lag and the "work to be done" as a function of the water activity showed similar properties, but in rich medium above 5% salt concentrations, the data showed a maximum for this work. An accurate description of the lag time is important to avoid food wastage, which is an issue of increasing significance in the food industry, while maintaining food safety standards.
journal_name
Appl Environ Microbioljournal_title
Applied and environmental microbiologyauthors
Zhou K,George SM,Métris A,Li PL,Baranyi Jdoi
10.1128/AEM.02629-10subject
Has Abstractpub_date
2011-03-01 00:00:00pages
1758-62issue
5eissn
0099-2240issn
1098-5336pii
AEM.02629-10journal_volume
77pub_type
杂志文章abstract::[This corrects the article on p. 531 in vol. 41.]. ...
journal_title:Applied and environmental microbiology
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