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Survival of Pseudomonas fluorescens and Salmonella typhimurium after electron beam and gamma irradiation of refrigerated beef.

Author(s) : CHUNG M. S., KO Y. T, KIM W. S.

Type of article: Article

Summary

The radurization effects of gamma ray and electron beam irradiation at 1.5 and 3.0 kGy on beef steaks inoculated with Salmonella typhimurium and Pseudomonas fluorescens were investigated during 8 days of storage at 5 °C. Total bacterial counts and numbers of Salmonella typhimurium and P. fluorescens were analyzed at 2-days intervals. Total bacterial counts of samples irradiated by both gamma rays and electron beam were significantly (P < 0.05) reduced by 3.8 to 5.3 log CFU/g, Salmonella typhimurium was not detectable during the experimental period. P. fluorescens counts of samples irradiated by gamma ray at both 1.5 and 3.0 kGy were not detected; however, P. fluorescens in samples irradiated by electron beam at 1.5 and 3.0 kGy was recovered after 2 days, and bacterial counts reached 7.8 and 6.9 log CFU/g, respectively. Both gamma ray and electron beam irradiation reduced total bacterial counts initially. Irradiation was very effective in destroying Salmonella typhimurium; however, P. fluorescens was not completely eliminated by electron beam irradiation. Gamma ray irradiation was thus more effective than electron beam irradiation in the destruction of P. fluorescens.

Details

  • Original title: Survival of Pseudomonas fluorescens and Salmonella typhimurium after electron beam and gamma irradiation of refrigerated beef.
  • Record ID : 2001-1464
  • Languages: English
  • Source: Journal of Food Protection - vol. 63 - n. 2
  • Publication date: 2000/02
  • Document available for consultation in the library of the IIR headquarters only.

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