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首页> 外文期刊>Applied Microbiology >Gamma-Ray Sterilization and Residual Toxicity Studies of Ground Beef Inoculated with Spores of Clostridium botulinum
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Gamma-Ray Sterilization and Residual Toxicity Studies of Ground Beef Inoculated with Spores of Clostridium botulinum

机译：肉毒梭菌孢子接种的绞牛肉的伽马射线灭菌和残留毒性研究

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Inoculated packs of cooked and raw ground beef were sterilized with gamma radiation from cobalt-60. With inocula of 5,000,000 Clostridium botulinum 213B spores per g of cooked ground beef, 3.8 megarad were required for sterilization; in raw ground beef, 3.72 megarad sterilized the meat when inocula of 1,700,000 C. botulinum 213B spores were used per g. Using C. botulinum 62A spores, cooked ground beef inoculated with 5,200,000 spores per g was sterilized with 3.85 megarad; raw ground beef, inoculated with 2,670,000 spores per g, was sterilized with 3.6 megarad. Cans of meat that were considered sterile by lack of culture growth after incubation for at least 6 months and, in some instances, as long as 5 years, were tested for the presence of botulinus toxin. No toxin was found in any meat taken from inoculated packs prepared from C. botulinum 213B spores; however, all cans of meat that had been inoculated with more than 2,670,000 C. botulinum 62A spores per g of meat, contained type A toxin. It was shown that these latter inocula of heat-shocked spores, by themselves, contained sufficient toxin to kill mice. However, more toxin appeared to be present than could be ascribed to the unirradiated spores alone. This finding is discussed.
机译：用来自60号钴的伽马射线对接种的熟牛肉和生碎牛肉进行消毒。每克煮熟的碎牛肉接种5,000,000个肉毒梭菌213B孢子，灭菌需要3.8兆拉德;在生牛肉碎中，每克使用170万个C.肉毒杆菌213B孢子接种，可对肉进行3.72兆拉德消毒。使用肉毒梭菌62A孢子，将每克接种了5,200,000孢子的煮熟的碎牛肉用3.85兆拉德杀菌;每克接种了2,670,000孢子的生碎牛肉用3.6兆拉德杀菌。在检测了至少6个月（有时长达5年）后因培养物缺乏生长而被认为不育的肉罐，进行了肉毒杆菌毒素检测。从由肉毒梭菌213B孢子制成的接种包装中取出的任何肉中均未发现毒素。但是，所有每罐肉中接种了超过267万股肉毒杆菌62A孢子的肉，都含有A型毒素。结果表明，这些后来的热激孢子接种物本身就具有足以杀死小鼠的毒素。但是，似乎存在的毒素比单独未辐照的孢子多。讨论了这一发现。

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