Abstract
ABSTRACTUSDA Choice and Utility grade boneless beef loins were used to determine the palatability, bacteriological and histological characteristics of steaks mechanically tenderized. There was a significant improvement in taste panel ratings of tenderness for the Utility tenderized steaks, but only a small improvement (P > 0.05) for the Choice tenderized steaks. None of the total aerobic bacterial surface counts or the interior counts for total aerobic, psychotropic or anaerobic bacteria was significantly different, between tenderized and nontenderized steaks compared at 1, 2, 5 and 10 days of storage at 5°C. Histological studies showed a definite pattern of blade penetrations in the tenderized samples at low magnifications. At very high magnifications, the muscle fibers were torn and fragmented by the blade rather than evenly cut.
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