A Model for the Inhibition of Listeria monocytogenes by Lactobacillus plantarum, Established using a Modified Jameson-effect Model
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Abstract:
The inhibitory effect of Lactobacillus plantarum on the growth of Listeria monocytogenes was investigated, and a model for demonstrating this inhibition was constructed using a modified Jameson-effect model. A Lac. plantarum pure culture and a mixed culture of Lac. plantarum and Lis. monocytogenes were obtained using the dilution method, and were cultivated in thermostat incubators at 7 ℃, 14 ℃, 21 ℃, 28 ℃, and 35 ℃, respectively. Samples were collected periodically and the bacterial count was recorded. The Lis. monocytogenes pure culture data were obtained from the ComBase database. Based on the data of the mixed culture, the Baranyi model was selected as the primary model and was used for fitting to estimate the maximum growth rate (μmax) and lag phase (λ). Subsequently, the modified Jameson-effect model was employed to establish the model for the inhibition of Lis. monocytogenes by Lac. plantarum, and validation of the model was performed. Lac. plantarum did not grow at 7 ℃ and exhibited a significant inhibitory effect on Lis. monocytogenes at 14 ℃, 21 ℃, 28 ℃, and 35 ℃. Validation of the inhibition model showed that the mean square error (MSE), bias factor (Bf), and accuracy factor (Af) values were in a range of 0.07~0.10, 0.98~1.04, and ~1, respectively, indicating that the modified Jameson-effect model could effectively predict the growth of Lis. monocytogenes in the presence of Lac. plantarum as an inhibitor.
