Photoelectrochemical sterilization of microbial cells by semiconductor powders

Tadashi Matsunaga*, Ryozo Tomoda, Toshiaki Nakajima, Hitoshi Wake

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1299 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)211-214
Number of pages4
JournalFEMS Microbiology Letters
Issue number1-2
Publication statusPublished - 1985
Externally publishedYes


  • coenzyme A
  • Saccharomyces cerevisiae
  • semiconductor
  • Sterilization

ASJC Scopus subject areas

  • Microbiology
  • Medicine(all)
  • Molecular Biology
  • Genetics


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