Journal
LETTERS IN APPLIED MICROBIOLOGY
Volume 64, Issue 4, Pages 309-316Publisher
WILEY
DOI: 10.1111/lam.12721
Keywords
background microflora; chilled pork; growth characteristics; Listeria monocytogenes; predictive model
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Funding
- Natural Science Foundation of China [31401558]
- Fundamental Research Funds for the Central Universities [KJQN201548]
- China Agriculture Research System [CARS-36-11B]
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The aim of this study was to analyse the growth kinetics of Listeria monocytogenes in naturally contaminated chilled pork. A cocktail of 26 meat-borne L. monocytogenes was inoculated to raw or sterile chilled pork to observe its growth at 4, 10, 16, 22 and 28 degrees C respectively. The growth data were fitted by the Baranyi model and Ratkowsky square-root model. Results showed that the Baranyi model and Ratkowsky square-root model could describe the growth characteristics of L. monocytogenes at different temperatures reasonably well in raw chilled pork (1.0 <= Bf <= Af <= 1.1). Compared with the growth of L. monocytogenes in sterile chilled pork, the background microflora had no impact on the growth parameters of L. monocytogenes, except for the lag phase at low temperature storage. The microbial predictive models developed in this study can be used to predict the growth of L. monocytogenes during natural spoilage, and construct quantitative risk assessments in chilled pork.
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