The hydroxyl radical generated from aluminum anodic oxide film by UV irradiation was evaluated using ESR measurement and its antimicrobial characteristic was also investigated using a photoirradiation film contact method. DMPO-OH adduct was detected by ESR measurement with DMPO (5,5-Dimethyl-Pyrroline-N-Oxide) as a spin trap reagent when aluminum anodic oxide film was irradiated by UV. In regard to bactericidal activity to
E. coli using photoirradiation film contact method, it decreased the number of the survived
E. coli by photoirradiation. From these results, it found that hydroxyl radical generated from aluminum anodic oxide film and that the aluminum anodic oxide film had antimicrobial action by photoirradiation.
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