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Modelling the Growth of <i>Listeria monocytogenes</i> on Fresh-Cut Cucumbers at Various Storage Temperatures
oleh: Ke Feng, Sarengaowa, Junyi Ma, Wenzhong Hu
Format: | Article |
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Diterbitkan: | MDPI AG 2024-06-01 |
Deskripsi
The primary objective of this study was to investigate the behavior of <i>Listeria monocytogenes</i> (<i>L. monocytogenes</i>) on fresh-cut cucumbers. Fresh-cut cucumber samples were inoculated with a mixture of six strains of <i>L. monocytogenes</i>. The inoculated samples were stored at 5, 10, 15, 20, 25, 30, and 35 °C. The results demonstrated that <i>L. monocytogenes</i> was able to grow on fresh-cut cucumbers at all the evaluated temperatures, although its growth decreased but was not inhibited at 5 °C. An extreme storage temperature of 35 °C considerably reduced the lag time. <i>L. monocytogenes</i> growth on fresh-cut cucumbers was controlled for several days by storage at a low temperature, mainly at 5 °C. Thus, this product should only be stored at low temperatures. The growth process was fitted by the Baranyi model, with the specific growth rates equally well-fitted to the Ratkowsky square-root model. The R-square and mean square error values for the corresponding Ratkowsky square-root models were 0.97 (R<sup>2</sup> > 0.95) and 0.02, respectively. The Baranyi and Ratkowsky square-root models exhibited good relevancy. The predictive models developed in this study can be used to estimate the risk assessment of <i>L. monocytogenes</i> on fresh-cut cucumber.