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- W2044584932 abstract "A total of 116 commercial samples of mixed vegetable salads, packaged in plastic bags, were examined for the presence of Listeria monocytogenes during storage at 4C. Commercial products, belonging to 4 different batches, were sampled over a period of one year and stored for 300 h at 4C in the laboratory. Different sets of enrichment and plating media were used to recover organisms, with subsequent identification by Pasco System and serotyping techniques. Out of a total of 70 control (noninoculated) samples, 21 (30%) were observed to contain Listeria monocytogenes, belonging to serotypes 3a and 3b. A study of salad inoculated with 103 cfu/g Listeria monocytogenes showed that the initial inoculum increased less than tenfold over the experimental period (300 h). During storage of the product, CO2 reached nearly 30% and O2 was no longer detected at 60 h, due to the respiration of the vegetables. The pH inside the packages remained around 6. The specific growth rate in the salad was calculated using the Dmodel Program, which gave a rate of 0.003h-1, a lower figure than that reported by other authors. This study found growth patterns different to those previously reported for salads with separate ingredients. Our results agree with previous reports that modified atmosphere does not greatly inhibit Listeria monocytogenes. This reflects a lower specific growth rate in this food compared to media, and illustrates the difficulty of validating, in complex food systems, mathematic models based on culture media." @default.
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- W2044584932 date "1996-05-01" @default.
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- W2044584932 title "INCIDENCE, SURVIVAL AND GROWTH OF LISTERIA MONOCYTOGENES IN READY-TO-USE MIXED VEGETABLE SALADS IN SPAIN" @default.
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- W2044584932 doi "https://doi.org/10.1111/j.1745-4565.1996.tb00152.x" @default.
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