Growth characteristics of Listeria monocytogenes as affected by a native microflora in cooked ham under refrigerated and temperature abuse conditions (original) (raw)

Abstract

This study examined the growth characteristics of Listeria monocytogenes as affected by a native microflora in cooked ham at refrigerated and abuse temperatures. A five-strain mixture of L. monocytogenes and a native microflora, consisting of Brochothrix spp., isolated from cooked meat were inoculated alone (monocultured) or co-inoculated (co-cultured) onto cooked ham slices. The growth characteristics, lag phase duration (LPD, h), growth rate (GR, log 10 cfu/h), and maximum population density (MPD, log 10 cfu/g), of L. monocytogenes and the native microflora in vacuum-packed ham slices stored at 4, 6, 8, 10, and 12 C for up to 5 weeks were determined. At 4e12 C, the LPDs of co-cultured L. monocytogenes were not significantly different from those of monocultured L. monocytogenes in ham, indicating the LPDs of L. monocytogenes at 4e12 C were not influenced by the presence of the native microflora. At 4e8 C, the GRs of co-cultured L. monocytogenes (0.0114e0.0130 log 10 cfu/h) were statistically but marginally lower than those of monocultured L. monocytogenes (0.0132e0.0145 log 10 cfu/h), indicating the GRs of L. monocytogenes at 4e8 C were reduced by the presence of the native microflora. The GRs of L. monocytogenes were reduced by 8e7% with the presence of the native microflora at 4e8 C, whereas there was less influence of the native microflora on the GRs of L. monocytogenes at 10 and 12 C. The MPDs of L. monocytogenes at 4e8 C were also reduced by the presence of the native microflora. Data from this study provide additional information regarding the growth suppression of L. monocytogenes by the native microflora for assessing the survival and growth of L. monocytogenes in ready-to-eat meat products.

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