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| Modeling the Inhibitory Effect of Lactobacillus plantarum on the Growth of Listeria monocytogenes in Pork |
| ZHANG Wenmin, DONG Qingli, LIU Yangtai, XIN Bao, QIAN Wenwen |
| 1. School of Public Health, Shaanxi University of Chinese Medicine, Xianyang 712046, China; 2. School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China |
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Abstract The maximum population density (Nmax) of Listeria monocytogenes in foods plays an important role in the probability of suffering listeriosis. Probiotics are widely used as bioprotective culture in foods to control the growth of L. monocytogenes. In complex food environments, the impact of probiotic on the growth characteristics of L. monocytogenes can be described by a model describing inter-bacteria competitive inhibition. In this study, we first confirmed the growth ability of Lactobacillus plantarum CICC6257 in pork and explored its effect on pork quality. Then, we validated the accuracy of microbial counting results with selective culture medium. Finally, the antagonistic ability of L. plantarum CICC6257 against L. monocytogenes was investigated on the basis of predictive microbiology. Results showed that L. plantarum CICC6257 could grow well in pork and reach the stationary phase after 60 h at 13 ℃. L. plantarum CICC6257 had no significant effect on the pH of pork within the shelf-life period (P ≥ 0.05). Moreover, both species were well isolated by the selective medium. The Jameson-effect model accurately described the inhibitory effect of L. plantarum CICC6257 on L. monocytogenes in pork. The presence of L. plantarum CICC6257 showed no significant effect on the lag phase (λ) or maximal growth rate (μmax) of L. monocytogenes (P ≥ 0.05), but decreased the Nmax significantly by 0.75 (lg (CFU/g)) (P < 0.05).
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2024, Vol. 38 
