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Thermal Inactivation of Salmonella spp., Salmonella typhimurium DT104, and Escherichia coli 0157:H7 in Ground Beef
Author(s) -
Smith S.E.,
Maurer J.L.,
OrtaRamirez A.,
Ryser E.T.,
Smith D.M.
Publication year - 2001
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.2001.tb16099.x
Subject(s) - salmonella , escherichia coli , food science , strain (injury) , microbiology and biotechnology , enterobacteriaceae , inoculation , chemistry , raw meat , biology , bacteria , biochemistry , gene , genetics , immunology , anatomy
In 19.1% fat ground beef, Escherichia coli 0157:H7 was less heat‐ resistant at ≥58°C than the Salmonella typhimurium DT104 and Salmonella senftenberg , but at 55°C the D value was similar to DT104 strains and higher than an eight‐strain Salmonella cocktail. Inactivation of E. coli 0157:H7 was more temperature‐dependent than the cocktail and DT104 strains. E. coli and DT104 strains were more heat‐resistant in beef containing 19% fat than 4.8% fat. The cocktail was more thermally stable in stationary as compared to log phase. Freezing of inoculated raw meat decreased heat resistance of the cocktail. The pathogenic strain, growth phase of the organism, state of the meat (fresh or frozen) and meat composition must be considered when designing protocols to verify thermal processes.