Preservative ability of wood to be fixed hydroxyl apatite substituted for antimicrobial metals
Y Haruhiko, I Sumaru
We succeeded in forming hydroxy apatite (HAp) in wood. HAp is non-toxicity and safe. Preservative ability of the wood, which substituted one part of Ca of constituent element of this HA p for antibacterial metals was measured. When Ca was substituted for Ag or Zn, mass loss in decay by brown-rot fungus F. palustris was restrained in about 50% (Ag) ~30% (Zn) of value of control specimen. However, when Ca was substituted for Cu, because F. palustris was copper-resistant microorganism, there was hardly the preservative ability. In case of decay by white-rot fungus T. versicolor, when Ca was substituted for Ag or Cu, the preservative ability was shown. In particular high preservative ability was provided when Ca was substituted for Cu + Zn or Ag + Zn. However, there was hardly the preservative ability when Ca was substituted for only Zn.