Heat Inactivation of Escherichia coli O157:H7 in Turkey Meat as Affected by Sodium Chloride, Sodium Lactate, Polyphosphate, and Fat Content .

The purpose of this research was to determine the survival of Escherichia coli O157:H7 when heated in ground turkey containing various additives and fat levels. values and values were determined for low (3%)- and high (11 %)- fat ground turkey with or without one of three additives: 8% NaCl, 4% sodium lactate, or a mixture of 8% NaCl, 4% sodium lactate, and 0.5% polyphosphate. Products inoculated with E. coli O157:H7 strain 204P were mixed, aseptically placed into thermal-death-time (TDT) tubes which were sealed and heated at 52, 55, 57 and 60°C. Survival was determined by enumeration on phenol red sorbitol agar, and values were calculated by two methods. Mean values ranged from 46.8 to 104.8 min; mean values ranged from 7.7 to 27.2 min; mean values ranged from 2.7 to 13.0 min; and mean values ranged from 0.7 to 4.8 min. The greatest survival, as evidenced by higher ( < 0.001) values, occurred in turkey containing the mixture of additives. The values ranged from 6.09 to 4.08°C, and higher values were obtained in turkey meat containing the additive mixture versus other turkey additive formulations. The additives evaluated enhanced survival of E. coli O157:H7 in cooked turkey meat as compared to turkey meat with no additives. In contrast to earlier reports, added fat did not enhance survival ( > 0.05). Product formulation should be a critical consideration when safe cooking processes are developed for ready-to-eat turkey products.