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International Journal of Poultry Science

.: Home > International Journal of Poultry Science > 2012 > Volume 11 Number 3 > A. Morey, M. Singh and S.R. McKee

Efficacy of Manufacturer Recommended Microwave Time Against Listeria monocytogenes in Ready-to-Eat Chicken Products

A. Morey, M. Singh and S.R. McKee
Department of Poultry Science, 201 Poultry Science Building, 260 Lem Morrison Dr., Auburn University, Auburn, AL 36849, USA
Abstract :

This study evaluated the effect of manufacturer-recommended microwave times on Listeria monocytogenes in Ready-to-Eat (RTE) poultry products. Three chicken products including battered and breaded chicken patties, fully cooked chicken breast fillets (both frozen) and chicken sausages (refrigerated) were inoculated with streptomycin-resistant (1500 µg/ml) L. monocytogenes (Brie 1) at low (ca. ~4 log10 CFU/ml) and high (ca. ~9 log10 CFU /ml) levels. Following 12 h of either frozen or refrigerated storage, random samples (n = 3 of each product) were individually microwaved for recommended time, undercooked and overcooked. Survival of L. monocytogenes after microwaving was determined by spread plating the samples and enumerating bacterial colonies on BHIA+streptomycin (1500 µg/ml). Analysis of variance with Duncans' grouping was conducted to determine significant differences in survival (alpha = 0.05). Microwaving the chicken patties inoculated with high levels of bacteria for a recommended time of 1 min increased surface temperature to 64°C-74°C leading to approximately 1-log reduction (p<0.05) of L. monocytogenes. Chicken breast samples and sausages microwaved at 1100 W according to manufacturer's instruction reduced L. monocytogenes populations below detection limit at high as well as low levels. Although, recommended microwaving times might not always be effective in eliminating L. monocytogenes, its efficacy will depend upon factors such as product type and the level of L. monocytogenes contamination. Reconstitution of RTE foods below recommended times can make them a potential source of Listeria.

Keywords :
Microwave, Listeria monocytogenes , ready-to-eat chicken

Date Deposited : 27 Feb 2015 10:55

Last Modified : 27 Feb 2015 10:55

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Volume 11, Number 3, - 2012 , ISSN 1682-8356

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