Abstract
D 10 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 D 10 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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