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Evaluation of Salmonella Thermal Inactivation Model Validity for Slow Cooking of Whole-Muscle Meat Roasts in a Pilot-Scale Oven.
- Source :
-
Journal of Food Protection . Nov2014, Vol. 77 Issue 11, p1897-1903. 7p. - Publication Year :
- 2014
-
Abstract
- Sublethal heating can increase subsequent thermal resistance of bacteria, which may compromise the validity of thermal process validations for slow-roasted meats. Therefore, this research evaluated the accuracy of a traditional log-linear inactivation model, developed via prior laboratory-scale isothermal tests, and a novel path-dependent model accounting for sublethal injury, applied to pilot-scale slow cooking of whole-muscle roasts. Irradiated turkey breasts, beef rounds, and pork loins were inoculated with an eight-serovar Salmonella cocktail via vacuum tumble marination in a salt-phosphate marinade. The resulting initial Salmonella population in the geometric center (core) was 7.0, 6.3, and 6.3 log CFU/g for turkey, beef, and pork, respectively. Seven different cooking schedules representing industry practices were evaluated in a pilot-scale, moist-air convection oven. Core temperatures recorded during cooking were used to calculate lethality real-time via the log-linear model. The path-dependent model reduced the bias (mean residual) and root mean square error by 4.24 and 4.60 log CFU/g respectively, in turkey; however, the new model did not reduce the prediction error in beef or pork. Overall, results demonstrated that slow-cooked roasts, processed to a computed lethality at or near that required by the regulatory performance standards, as calculated with a state-dependent model, may be underprocessed. [ABSTRACT FROM AUTHOR]
- Subjects :
- *HEATING
*THERMAL resistance
*SALMONELLA
*ANIMAL carcasses
*SLOW cooking
Subjects
Details
- Language :
- English
- ISSN :
- 0362028X
- Volume :
- 77
- Issue :
- 11
- Database :
- Academic Search Index
- Journal :
- Journal of Food Protection
- Publication Type :
- Academic Journal
- Accession number :
- 99418378
- Full Text :
- https://doi.org/10.4315/0362-028X.JFP-14-035