Survival of Listeria monocytogenes, Yersinia enterocolitica and Escherichia coli O157:H7 and Quality Changes After Irradiation of Beef Steaks and Ground Beef |
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| Authors: | AN-HUNG FU J G SEBRANEK E A MURANO |
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| Affiliation: | Authors Fu and Sebranek are with the Departments of Animal Science and of Food Science &Human Nutrition, Iowa State University, Ames, IA 50017.;Author Murano is with the Dept. of Microbiology, Immunology, and Preventive Medicine, Iowa State University, Ames, IA 50017. |
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| Abstract: | Beef steaks and ground beef were inoculated with Listeria monocytogenes, Yersinia enterocolitica, or Escherichia coli O157:H7. Samples were packaged in air or under vacuum and irradiated at low (0.60 to 0.80 kGy) or medium (1.5 to 2.0 kGy) doses, with each dose delivered at either a low (2.8 M/min conveyor speed) or high (6.9 M/min) dose rate. Medium-dose irradiation accompanied by 7°C storage resulted in no Y. enterocolitica or E. coli O157:H7 survivors being detected. There was no effect on survival of the pathogens by dose rate or storage atmosphere. No difference (P>0.05) was observed in meat pH or color, but TBA values increased after 7 days storage. |
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| Keywords: | beef pathogens microbials irradiation |
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