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Effect of feed gas composition of gas discharge plasmas on Bacillus pumilus spore mortality
Author(s) -
Purevdorj D.,
Igura N.,
Ariyada O.,
Hayakawa I.
Publication year - 2003
Publication title -
letters in applied microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.698
H-Index - 110
eISSN - 1472-765X
pISSN - 0266-8254
DOI - 10.1046/j.1472-765x.2003.01341.x
Subject(s) - bacillus pumilus , spore , gas composition , chemistry , inert gas , plasma , volume (thermodynamics) , helium , chromatography , analytical chemistry (journal) , microbiology and biotechnology , bacteria , biology , organic chemistry , physics , genetics , quantum mechanics , thermodynamics
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.