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      Bactericidal activity of electrolyzed acid water from solution containing sodium chloride at low concentration, in comparison with that at high concentration

        Hiromasa Kiura, Kouichi Sano, Shinichi Morimatsu, Takashi Nakano, Chizuko Morita, Masaki Yamaguchi, Toyoyuki Maeda, Yoji Katsuoka, Department of Microbiology, Osaka Medical College, Takatsuki, Osaka, Japan Department of Urology, Osaka Medical College, Takatsuki, Osaka Japan Department of Medical Instruments, Kaigen Co., Ltd., Osaka, Japan
        Received 20 August 2001; received in revised form 15 November 2001; accepted 13 December 2001

      Abstract

        Electrolyzed strong acid water (ESW) containing free chlorine at various concentrations is becoming to be available clinical settings as a disinfectant. ESW is prepared by electrolysis of a NaCl solution, and has a corrosive activity against
        instruments. Although lower concentrations of NaCl and free chlorine are desired to eliminate corrosion, the germicidal ESW with low NaCl and free-chlorine concentrations (ESW-L) has not been fully clarified. In this study, we demonstrated ESW-L possesses bactericidal activity against Mycobacteria and spores of Bacillus subtilis. The effect was slightly weaker that of ESW containing higher NaCl and free-chlorine concentrations (ESW-H), but acceptable as a disinfectant. To clarify mechanism of the bactericidal activity, we investigated ESW-L-treated Pseudomonas aeruginosa by transmission microscopy, a bacterial enzyme assay and restriction fragment length polymorphism pattern (RFLP) assay. Since the bacterium, whose growth was completely inhibited by ESW-L, revealed the inactivation of cytoplasmic enzyme, blebs and breaks outer membrane and remained complete RFLP of DNA, damage of the outer membrane and inactivation of cytoplasmic are the important determinants of the bactericidal activity.
        © 2002 Elsevier Science B.V. All rights reserved.

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