Effect of feed gas composition of gas discharge plasmas on Bacillus pumilus spore mortality

D. Purevdorj, Noriyuki Igura, O. Ariyada, I. Hayakawa

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

Aims: To investigate the effect of gas composition on the sensitivity of Bacillus pumilus spores to gas plasmas. Methods and Results: Inert gas plasmas, oxygen-based plasmas and various moisturized air plasmas were used to inactivate B. pumilus spores in low gas pressure of 50 Pa. Although the treatment temperature did not exceed 55°C when exciting these plasmas, spore survival varied widely depending on the composition of the gas feed. Higher spore mortality was acquired by inert gases of low molecular weight except for helium. The highest spore mortality (4.54log reduction) was obtained when air with a 0.05 molar fraction of water vapour was used as the plasma carrier gas. Conclusions: Water molecules in the plasma carrier gas play a significant role in inactivation of B. pumilus spores. Significance and Impact of the Study: This strong inactivation may occur through hydroxyl free radicals generated from the moisturized air plasma.

Original languageEnglish
Pages (from-to)31-34
Number of pages4
JournalLetters in Applied Microbiology
Volume37
Issue number1
DOIs
Publication statusPublished - Jul 11 2003

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Plasma Gases
Bacilli
Spores
Discharge (fluid mechanics)
spore
Gases
Plasmas
plasma
mortality
Mortality
Chemical analysis
gas
Noble Gases
Air
Inert gases
Helium
air
Steam
Hydroxyl Radical
Free Radicals

All Science Journal Classification (ASJC) codes

  • Applied Microbiology and Biotechnology

Cite this

Effect of feed gas composition of gas discharge plasmas on Bacillus pumilus spore mortality. / Purevdorj, D.; Igura, Noriyuki; Ariyada, O.; Hayakawa, I.

In: Letters in Applied Microbiology, Vol. 37, No. 1, 11.07.2003, p. 31-34.

Research output: Contribution to journalArticle

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