A study was conducted to investigate the reduction and elimination of Escherichia coli O157:H7 by the effects of gamma irradiation and ozone treatment. Log phase cells were found to be more sensitive to gamma irradiation than stationary phase cells. E. coli O157:H7 was found tobe considerably more resistant to irradiation at −18°C than at 20°C. The D values for this organism for treatment with ozone in tryptic soy agar were higher than those for treatment with ozone in phosphate buffer. Gamma irradiation at a dose of 1.5 kGy or ozone treatment at a concentration of 3 to 18 ppm for 20 to 50 min was required to assure the elimination of E. coli O157:H7.
Gamma Irradiation and Ozone Treatment for Inactivation of Escherichia coli O157:H7 in Culture Media
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MYUNG-WOO BYUN, OH-JIN KWON, HONG-SUN YOOK, KYONG-SU KIM; Gamma Irradiation and Ozone Treatment for Inactivation of Escherichia coli O157:H7 in Culture Media. J Food Prot 1 June 1998; 61 (6): 728–730. doi: https://doi.org/10.4315/0362-028X-61.6.728
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