摘要：In recent years, consumers have become increasingly aware of bacterial eradication in household laundering. As a result, a number of laundry detergents carry the indication “For bacterial eradication” on their packages. We attempted to evaluate the bacterial eradication effect of laundry detergents and bactericidal products and explored relevant study designs. It was found that washing test apparatuses, test clothes and methods for evaluating washing ability have already been set as part of the test for color fastness against washing (JIS L0844) and the test for synthetic detergents (JIS K3362). However, it was also found that a specified washing test apparatus would be necessary to perform the recommended microbial test and that considerable time and effort would be needed to prepare the contaminated clothes (JIS C9606 Annex 4 and artificially contaminated wet cloth of the Laundry Science Association). We therefore explored methods at laboratory level to develop a simpler bacterial eradication test for washing. We evaluated ordinary laundry detergents marketed by detergent manufacturers and those labeled “For bacterial eradication” and also investigated the effect of bactericidal products with silver content. It was found that Staphylococcus aureus , a Gram-positive coccus, was eradicated more satisfactorily by the laundry soaps labeled “For bacterial eradication” than ordinary laundry soaps. In contrast, Pseudomonas aeruginosa , a Gram-negative bacillus, showed no difference in eradication level between the two types. Bactericidal washing products containing silver showed sufficient bactericidal effect against both species. We conclude that these findings have established basic considerations for the standardization of bacterial eradication testing of detergents.
