Bactericidal and Virucidal Effects of Chlorous Acid Water and Sodium Hypochlorite in a Suspension Containing Organic Substances

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  • 亜塩素酸水と次亜塩素酸ナトリウムの有機物存在下における殺菌効果およびウイルス不活化効果
  • アエンソサンスイ ト ジアエンソサン ナトリウム ノ ユウキブツ ソンザイ カ ニ オケル サッキン コウカ オヨビ ウイルス フカツカ コウカ

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 Sodium hypochlorite has been widely used as an effective disinfectant, but involves possible hazards to health. Chlorous acid water is considered less hazardous compared with sodium hypochlorite. The bactericidal and virucidal effects of chlorous acid water were evaluated using suspensions of Escherichia coli (E.coli) and feline calicivirus (FCV). In general, the activities of disinfectants might be affected by the presence of organic substances such as bovine serum albumin (BSA). Higher BSA concentration requires greater free available chlorine ion concentration for inactivating E.coli and FCV, but chlorous acid water clearly inactivated both E.coli and FCV. Consequently, chlorous acid water is an effective disinfectant even in the presence of organic substances. Furthermore, the presence of organic substances could reduce the effectiveness of sodium hypochlorite. The bactericidal and virucidal activities of sodium hypochlorite and chlorous acid water were evaluated in the presence of bovine serum albumin (BSA). When sodium hypochlorite was added to BSA, the concentration of free available chlorine ion declined sharply. In contrast, when chlorous acid water was added to BSA, free available chlorine ion was detected as rapidly as within 30 min and 40~70% of free available chlorine ion was retained. The bactericidal and virucidal effects of chlorous acid water and sodium hypochlorite were correlated with the concentrations of the residual free available chlorine ions. Therefore, chlorous acid water is far more effective than sodium hypochlorite as a disinfectant.<br>

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