銀担持抗菌剤の加熱処理プロセスに関する研究

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In this paper, the effect of the heat treating process for silver-carried zirconium phosphate antibacterial agent on its structure and component was investigated by X-ray diffraction (XRD), differential scanning calorimetry (DSC), transmission electron microscopy (TEM) and energy dispersive X-ray analysis (EDX). Its antibacterial activity and light permanency were also studied. The optimal heat treating temperature for antibacterial agent was 900℃, and the obtained antibacterial agent displayed uniform network structure as well as its crystal structure was almost the same as that of carrier except for small enhancements in the crystal space distance. When the treating temperature rose to 1100℃, the obtained antibacterial agent was irregular in shape ascribing to serious conglomeration, and its crystal structure began to decompose, whereas its mass fraction of element was not obviously affected. Moreover, increasing heat treating temperature, the light permanency improved, but the antibacterial activity declined. The antibacterial agent treated at 900℃ possessed an excellent antibacterial activity with the the minimum inhibitory concentrations (MICs) against E. coli and S. aureus of 100 mg・l^<-1> and 150 mg・l^<-1>, and good light permanency with the whiteness of 86.4% after exposure to UV light for 24 h. Furthermore, the antibacterial agent treated at 1100℃ displayed some antibacterial activity and preeminent light permanency.
2007-04-01