Survival of a native toxigenic isolate of Listeria monocytogenes CFR 1302 during storage of milk-based foods can be a potential cause of health risk.

Jayanth, H. S. and Varadaraj, M. C. (2017) Survival of a native toxigenic isolate of Listeria monocytogenes CFR 1302 during storage of milk-based foods can be a potential cause of health risk. Food Science and Technology International. pp. 1-11. ISSN 1082-0132

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Abstract

The ability of a native toxigenic culture of Listeria monocytogenes CFR 1302 to survive and elaborate associated toxigenic trait in ice cream and mango pulp-based lactic fermented milk was studied. The culture of L. monocytogenes inoculated at two initial levels of 4.6 and 5.6 log10 CFU/ml almost remained unaltered during storage of the food products. However, in both the milk-based products, a marginal increase in viable population was observed during 2–4 d of storage as against the initial inoculum levels. The toxigenic trait, listeriolysin ‘‘O’’ was detected by PCR based on species-specific hlyA primers in the two products without any step of enrichment. The positive amplification in PCR was evidenced with initial population levels of 6.3, 7.3, and 8.3 log10 CFU/ml of the respective products. In culture broth, PCR detection was positive with the lowest level of 2.3 log10 CFU/ml. The established pathogenic strain of L. monocytogenes Scott A used as a reference culture revealed almost the same behavior to that of native culture in the food products. The findings of present study bring into focus that, irrespective of low storage temperatures, there exists the potential health hazard associated with foods initially contaminated with risk population levels of L. monocytogenes.

Item Type:	Article
Uncontrolled Keywords:	Listeria monocytogenes, ice cream, mango pulp-based lactic fermented milk, polymerase chain reaction detection, toxigenic trait, survival
Subjects:	600 Technology > 08 Food technology > 27 Dairy products 600 Technology > 08 Food technology > 29 Microbiological food
Divisions:	Food Microbiology
Depositing User:	Food Sci. & Technol. Information Services
Date Deposited:	11 Jan 2018 04:31
Last Modified:	11 Jan 2018 04:31
URI:	http://ir.cftri.res.in/id/eprint/13280

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