水分活性とpHとの相乗作用によるブドウ球菌エンテロトキシン産生の抑制効果について

概要

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Combined effects of pH (4.5-7.4) and water activity (aw, 0.99-0.88) on the growth and enterotoxin production by five Staphylococcal strains 100, S-6, 361, K858 and T7436, producing enterotoxins A, B, C, AB, and AC, respectively, were studied in Brain Heart Infusion broth for 48hr. At 35C, Staphylococcal enterotoxin A (SEA) was produced at aw>0.92 or at pH>4.5, but no SEA was produced at aw 0.92 and pH 5.3. SEB and SEC were produced at aw>0.96 and pH>5.3 and aw>0.96 and pH>4.5, respectively. No SEB was produced at aw 0.96 and pH 5.3. No growth occurred at aw<0.92 and pH 4.5. The enterotoxin production changed depending on the interaction of these factors. SEA production was much less affected by aw and pH than was SEB and SEC. The enterotoxin production by the strains K858 and T7436 producing respectively SEA plus SEB and SEA plus SEC were both affected.
日本細菌学会の論文