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Photoelectrochemical sterilization of microbial cells by semiconductor powders

FEMS Microbiology Letters · 1985 · Vol. 29(1-2) · pp. 211–214

Tadashi Matsunaga✉(Tokyo University of Agriculture and Technology)Ryozo Tomoda(Tokyo University of Agriculture and Technology)Toshiaki Nakajima(Tokyo University of Agriculture and Technology)Hitoshi Wake(Tokyo University of Agriculture and Technology)

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Abstract

We report the novel concept of photochemical sterilization. Microbial cells were killed photoelectrochemically with semiconductor powder (platinum-loaded titanium oxide, TiO2/Pt). Coenzyme A, (CoA) in the whole cells was photo-electrochemically oxidized and, as a result, the respiration of cells was inhibited. Inhibition of respiratory activity caused death of the cells. Lactobacillus acidophilus, Saccharomyces cerevisiae and Escherichia coli (103 cells/ml respectively) were completely sterilized when they were incubated with TiO2/Pt particles under metal halide lamp irradiation for 60–120 min.

Advanced Photocatalysis Techniques TiO2 Photocatalysis and Solar Cells Advanced Nanomaterials in CatalysisSterilization (economics)ChemistryLactobacillus acidophilusPlatinumHalideMetalMicrobiologyIrradiationBacteriaBiochemistry

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