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Preliminary studies on radiation resistance of thermophilic anaerobic spores and the effect of gamma radiation on their heat resistance



Preliminary studies on radiation resistance of thermophilic anaerobic spores and the effect of gamma radiation on their heat resistance



International Journal of Food Microbiology 5(2): 129-136



D10 values of gamma irradiated spores of Clostridium thermosaccharolyticum ATCC 7956 and Desulfotomaculum nigrificans ATCC 7946 in spent mushroom-compost infusion were 2.54 kGy and 2.20 kGy, respectively, i.e. in the same range as the radiation D10 values of various mesophilic bacterial spores of much lower heat resistance than that of the thermophilic spores investigated. The combination of gamma irradiation with a subsequent heat treatment had a synergistic sporicidal effect which increased with increasing radiation doses. The heat sensitization of bacterial spores by irradiation seems to be decreasing with decreasing inherent heat resistance of various spore-formers. Heat sensitization of D. nigrificans spores by 2.5 kGy dose of gamma radiation could also be demonstrated when they were inoculated into cultivated mushrooms (Agaricus bisporus). It was, therefore, concluded that radiation doses which inhibit after-ripening and senescence of harvested fresh mushrooms may also improve under specific conditions the efficacy of the heat preservation of canned mushrooms.

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Accession: 006169466

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DOI: 10.1016/0168-1605(87)90030-4


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