Growth of Escherichia coli O157:H7, Salmonella Typhimurium DT104, and Listeria monocytogenes in Dark Cutting Beef at 10 or 22°C
Abstract:An experiment was conducted to determine the effects of the dark, firm, and dry (DFD) condition of beef on growth of the foodborne pathogens Escherichia coli O157:H7, Salmonella Typhimurium DT104, and Listeria monocytogenes Scott A in ground beef. Longissimus muscles from a DFD carcass (pH = 6.45) and normal carcass (N; pH = 5.64) were ground and samples obtained (100 and 0% DFD, respectively). Equal amounts of the 0 and 100% DFD ground samples were mixed to obtain 50% DFD samples. Inoculated 0, 50, and 100% DFD samples were packaged into oxygen-permeable overwrap and stored at 10°C for E. coli O157:H7, Salmonella Typhimurium DT104, and L. monocytogenes Scott A or at 22°C for E. coli O157:H7. Growth characteristics of E. coli O157:H7, Salmonella Typhimurium DT104, and L. monocytogenes Scott A did not differ (P > 0.05) between 0 and 100% DFD. Results indicated that the DFD beef used in this study was no more susceptible to growth of E. coli O157:H7, Salmonella Typhimurium, or L. monocytogenes Scott A than N beef.
Document Type: Research Article
Affiliations: 1: Camas County Extension Office, P.O. Box 429, Courthouse (Main Street), Fairfield, Idaho 83327-0429, USA 2: Department of Food Technology and Science, P.O. Box 1071, University of Tennessee, Knoxville, Tennessee 37901-1071, USA 3: Department of Animal and Veterinary Science, University of Idaho, Moscow, Idaho 83844-2330, USA
Publication date: January 1, 2002
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