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Effect of mixing ratio on bactericidal action of MgO–CaO powders

  • Osamu Yamamoto
  • Jun Sawai
  • Hiromitsu Kojima
  • Tadashi Sasamoto
Article

Abstract

MgO–CaO powders were prepared with different molar ratios (MgO/CaO) at 1400 °C for 2 h in air. By using the powder samples obtained, the change in bactericidal effect as a function of MgO–CaO composition was studied by colony count method. From the XRD measurements, it was found that CaO solid solution was formed by the replacement of Mg2+ ion with larger Ca2+ ion. However, no formation of MgO solid solution was observed. The average particle size and the specific surface area of the samples used in this study were about 0.2 μm and 10.5m2g−1, respectively. The pH values of physiological saline containing powder samples increased with the increase of CaO content, and the value reached 12.1 in sample with the molar ratio (MgO/CaO) of 0.25. From the results of bactericidal tests for Staphylococcus aureus, it was found that the bactericidal effect increased with the increase of CaO content in the samples.

Keywords

Particle Size Solid Solution Specific Surface Bactericidal Action Staphylococcus Aureus 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • Osamu Yamamoto
    • 1
  • Jun Sawai
    • 1
  • Hiromitsu Kojima
    • 1
  • Tadashi Sasamoto
    • 1
  1. 1.Department of Applied ChemistryKanagawa Institute of TechnologyAtsugiJapan

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