The Effect of Ca Content x for the Bactericidal Action of Zn1−xCaxO(x=0--0.20) Solid Solution Powders against Staphylococcus aureus

Jun SAWAI*, Osamu YAMAMOTO, Takashi SHIMURA, Hiromitsu KOJIMA and Tadashi SASAMOTO

Department of Applied Chemistry, Kanagawa Institute of Technology; 1030 Shimo-Ogino, Atsugi-shi 243-0292 Japan

The effect of Ca content in Zn1−xCaxO(x=0--0.20) powders on its bactericidal action against Staphylococcus aureus was investigated. The bactericidal action increased with an increase of Ca content in Zn1−xCaxO, indicating the possibility of control of the antimicrobial efficacy. The death of S. aureus by the powder slurries followed first-order kinetics, and the concentration of Ca dopant slightly enhanced the dilution coefficient of the bactericidal action. Though the pH value of as-prepared powder slurries also increased with the increase of Ca content, its bactericidal action was greater than NaOH solution with the same pH value as the slurries.

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