Abstract
To evaluate the antibacterial performance of photocatalytic coating, Japan Industrial Standard (JIS) committee has suggested the standard testing conditions for quantitative evaluation. However, these conditions had been constructed based on the experimental consideration from the coating formed on a glass substrate. In this study, to check the applicability of the JIS conditions to the coating on a titanium (Ti) substrate, the change of the survival rate of Escherichia coli (E. coli) on the Ti surface was evaluated. We confirmed that the decrease of microorganisms caused by dryness and UV-light were effectively suppressed by the use of these conditions. Furthermore, when testing the antibacterial performance of an anodic TiO2 layer on a Ti substrate, its performance could be evaluated clearly. In conclusion, we confirmed that the survival rate of E. coli on the Ti substrate could be evaluated by using the experimental conditions described in the JIS.
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