高圧処理とその後の加熱処理との組み合わせによる耐熱性芽胞の殺菌

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  • Sterilization of Heat-Resistant Spores by a Combination of High-Pressure and Subsequent Heat Treatment
  • コウアツ ショリ ト ソノゴ ノ カネツ ショリ ト ノ クミアワセ ニ ヨル タイネツセイ ガホウ ノ サッキン

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We found the feasibility of sterilization by applying a pressure treatment of 200 MPa before heat treatment. The wet density of spores of Bacillus cereus was decreased by the pressure history when we applied a high-pressure treatment of 200 MPa, and the heat resistance of the spores was decreased. Afterwards when we applied a heat at a medium-temperature of about 100℃, the sterilization of spores was promoted. Furthermore, we found the turbidity of the spore suspensions greatly decreased after the pressure reduction step of the high-pressure treatment. The decrease of turbidity was also found to be highly correlated with the survival spore counts after the heat treatment. Therefore the turbidity was considered to be a sterilization indicator.<br>

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