Inactivation of Escherichia Coli by a coaxial microwave plasma flow

Takehiko Sato, Akiko Doi, Takuya Urayama, Tatsuyuki Nakatani, Takashi Miyahara

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


An atmospheric low-temperature plasma flow generated by a microwave discharge utilizing a coaxial cable for microwave transmission was utilized for the inactivation of a bacteria. The employed device consists of a cavity, a quartz discharge tube, a coaxial cable, a microwave power source, and a gas supply system. Using this argon plasma source, we attempted to clarify the effects of exposure temperature, exposure time, exposure distance, input power, and gas flow rate on the number of surviving cells of Escherichia coli. A log reduction number of E. coli of at least 2 (10-2) was obtained at an exposure temperature of 353 K when the exposure time was 600 s with a gas flow rate of 5 Sl/min and an input power of 400 W. The number of surviving cells decreased with an increase of exposure time under any sterilization condition.

Original languageEnglish
Pages (from-to)1159-1163
Number of pages5
JournalIEEE Transactions on Industry Applications
Issue number5
Publication statusPublished - 2007 Sep


  • Atmospheric pressure
  • Colony counting
  • Escherichia coli
  • Low temperature
  • Morphological analysis
  • Plasma flow
  • Sterilization

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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