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Plasma Medicine
SJR: 0.278 SNIP: 0.183 CiteScore™: 0.57

ISSN Imprimir: 1947-5764
ISSN En Línea: 1947-5772

Plasma Medicine

DOI: 10.1615/PlasmaMed.2014010792
pages 237-247

Bacterial Inactivation in Liquids Using Multi-Gas Plasmas

Toshihiro Takamatsu
Department of Energy Sciences, Tokyo Institute of Technology, Yokohama, Japan
Akitsugu Kawate
Department of Energy Sciences, Tokyo Institute of Technology, Yokohama, Japan
Kodai Uehara
Department of Energy Sciences, Tokyo Institute of Technology, Yokohama, Japan
Takaya Oshita
Department of Energy Sciences, Tokyo Institute of Technology, Yokohama, Japan
Hidekazu Miyahara
Department of Energy Sciences, Tokyo Institute of Technology, Yokohama, Japan
Danil Dobrynin
C&J Nyheim Plasma Institute, Drexel University, Camden NJ 08103
Gregory Fridman
C&J Nyheim Plasma Institute, Drexel University, Camden, New Jersey 08103
Alexander A. Fridman
C&J Nyheim Plasma Institute, Drexel University, Camden, New Jersey 08103
Akitoshi Okino
Department of Energy Sciences, Tokyo Institute of Technology, Yokohama, Japan

SINOPSIS

Using a multi-gas plasma jet, we generated plasmas of various gas species such as argon, oxygen, nitrogen, carbon dioxide, and air. Photometric measurements of colorforming reactions were used to identify singlet oxygen, OH radicals, hydrogen peroxide, NO radicals, nitrite, and nitrate, which are important sterilization agents that are generated in the liquid phase. Oxygen plasma generated the largest amount of singlet oxygen, OH radicals, and hydrogen peroxide. Air plasma generated NO radicals, nitrite, and nitrate. The pH of air plasma−treated water for 120 s dropped below 3.0. The air plasma sterilized Escherichia coli in distilled water after 120 s of treatment. In addition, when the initial pH was fixed below 3.6, E. coli was more effectively sterilized by oxygen plasma. Furthermore, dimethylsulfoxide, which is an OH radical scavenger, suppressed the sterilization effect of oxygen plasma.