RT Journal Article ID 44aea49d6301d5bb A1 Takamatsu, Toshihiro A1 Kawate, Akitsugu A1 Uehara, Kodai A1 Oshita, Takaya A1 Miyahara, Hidekazu A1 Dobrynin, Danil A1 Fridman, Gregory A1 Fridman, Alexander A. A1 Okino, Akitoshi T1 Bacterial Inactivation in Liquids Using Multi-Gas Plasmas JF Plasma Medicine JO PMED YR 2012 FD 2014-07-22 VO 2 IS 4 SP 237 OP 247 K1 multi-gas plasma K1 nonthermal plasma K1 sterilization K1 pH measurement K1 reactive oxygen and nitrogen species K1 plasma medicine AB 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. PB Begell House LK https://www.dl.begellhouse.com/journals/5a5b4a3d419387fb,25266a5313ab0f35,44aea49d6301d5bb.html