Effect of Heat Treatment on Growth Inhibition of Escherichia coli in the Presence of Sodium Chloride.

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  • 塩化ナトリウム存在下における大腸菌の増殖抑制に及ぼす加熱処理の影響
  • エンカ ナトリウム ソンザイ カ ニ オケル ダイチョウキン ノ ゾウショク ヨクセイ ニ オヨボス カネツ ショリ ノ エイキョウ

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Abstract

Antibacterial action of heat treatment on Escherichia coli IFO3301 (E. coli) in the presence of sodium chloride was investigated. Sodium chloride (0.39M) more inhibited the growth of E. coli than any other reagents under heating at 55°C. The combined effect of sodium chloride and heating was facilitated by an addition of organic acid with longer chain of carbon atoms. The cell-surface hydrophobicity of E. coli increased with sodium chloride under heating. Release of lipopolysaccharide from the cell membrane was enhanced by heating and was promoted with the addition of sodium chloride. Heat treatment increased leakage of UV-absorbing substances from E. coli, while sodium chloride did not enhance leakage of UV-absorbing substances from the cell under heating.

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