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  • Title: Effects of Solution pH and Ions on Suicidal Germination of Bacillus subtilis Spores Induced by Medium High Temperature-Medium High Hydrostatic Pressure Treatment.
    Author: Morimatsu K, Nakaura Y, Inaoka T, Kimura K, Yamamoto K.
    Journal: Biocontrol Sci; 2019; 24(3):167-172. PubMed ID: 31527348.
    Abstract:
    Spores of Bacillus subtilis suspended in water or aqueous solution of NaCl, CaCl2, sodium lactate, or calcium lactate at pH 4 - 7 was subjected to spore inactivation by simultaneous combination of medium high hydrostatic pressure (MHHP; 100 MPa) treatment for germination and medium high temperature (MHT; 65℃) treatment for pasteurization of germinated vegetative cells. The spores at pH 4 in NaCl solution and those at pH 5 and 6 in Na lactate solutions were less killed than in water by MHHP+MHT treatment. Spore inactivation was promoted by calcium ion in NaCl solution at pH 4 and in Na lactate solutions at pH 5 and pH 6, while it was more suppressed at pH 5 and pH 6 in Na lactate solutions than at pH 4 in NaCl solution. The spores treated by MHHP+MHT in NaCl or Na lactate solution at pH 4 were further killed by subsequent MHT treatment.
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