The effect of common handling practices (i.e., freezing, thawing and cooking) of beef patties on the survival of
Salmonella spp. and Escherichia coli O157:H7, was evaluated. Inoculated ground beef was stored at –22 °C for 5
and 75 days. After thawing at 4 °C/16 h, 20 °C/12 h, inmicrowave/22–24 min, orwithout prior thawing, beef patties
(90 g) were shaped and cooked in oven-broiler or in pan-grill to internal temperatures of 60 °C or 71 °C.
Cooking in oven-broiler was more effective compared to pan-grill, especially when cooked to 71 °C. Defrosting
methods did not affect significantly (P ≥ 0.05) the survival of the pathogens during subsequent cooking. Frozen
storage for 75 days enhanced the survival of E. coli O157:H7, as the pathogen survived 3.1 logCFU/g when cooked
in oven-broiler at 71 °C. Results may supplement the existing guidelines for the appropriate practices, associated
with freezing, thawing and cooking of patties in households or catering services
The effect of common handling practices (i.e., freezing, thawing and cooking) of beef patties on the survival ofSalmonella spp. and Escherichia coli O157:H7, was evaluated. Inoculated ground beef was stored at –22 °C for 5and 75 days. After thawing at 4 °C/16 h, 20 °C/12 h, inmicrowave/22–24 min, orwithout prior thawing, beef patties(90 g) were shaped and cooked in oven-broiler or in pan-grill to internal temperatures of 60 °C or 71 °C.Cooking in oven-broiler was more effective compared to pan-grill, especially when cooked to 71 °C. Defrostingmethods did not affect significantly (P ≥ 0.05) the survival of the pathogens during subsequent cooking. Frozenstorage for 75 days enhanced the survival of E. coli O157:H7, as the pathogen survived 3.1 logCFU/g when cookedin oven-broiler at 71 °C. Results may supplement the existing guidelines for the appropriate practices, associatedwith freezing, thawing and cooking of patties in households or catering services
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