Study examines Salmonella resistance to heat treatment
August 17, 2009
by Bryan Salvage
CHICAGO — According to a study in the Journal of Food Science published by the Institute of Food Technologists, Salmonella was more resistant to heat treatment of whole cuts of beef than in ground beef products. Although the interior of whole cuts of beef products has long been assumed to be sterile, contamination and survival of pathogens have been reported.
Salmonella does migrate and survive inside the muscle, studies have found. Michigan State University researchers evaluated the relationship between heat resistance of Salmonella and degree of grinding (whole muscle, coarsely ground, finely ground and beef purée). All products came from the same original lot of beef and received the same thermal treatment.
The water status in meat may impact the effectiveness of Salmonella inactivation and bacteria may be suspended in the liquid component of the food, researchers suspected. Salmonella exhibited greater heat resistance in whole-muscle beef. The physical structure of beef products influenced Salmonella heat resistance. However, no significant difference in thermal resistance was seen between coarsely ground, finely ground and pureed samples, according to Bradley Marks, lead researcher.