Effect of liquid modified by non-equilibrium atmospheric pressure plasmas on bacteria inactivation rates

Shainsky, Natalie; Dobrynin, Danil; Ercan, Utku Kürşat; Joshi, Suresh G.; Fridman, Gregory; Friedman, Gary D.; Fridman, Alexander

doi:10.1109/plasma.2010.5533900

Cited by 4 publications

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“…[16][17][18] Although ozone is a good oxidizer, direct exposure of deionized water to plasma, which contains not only ozone but also charged species, reactive oxygen species, and radicals, [19] creates a much stronger oxidizer than ozone. [20][21][22][23] It has been reported that water treated by various plasma discharges becomes acidic, [9][10][11][20][21][22][23][24] which leads to antimicrobial effects. [9][10][11][24][25][26][27] The important question is which acid is created in water treated by plasma.…”

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confidence: 99%

“…[20][21][22][23] It has been reported that water treated by various plasma discharges becomes acidic, [9][10][11][20][21][22][23][24] which leads to antimicrobial effects. [9][10][11][24][25][26][27] The important question is which acid is created in water treated by plasma. Oehmigen et al [28] suggested that the acid created in water is nitric/nitrous acid and the antimicrobial properties observed are the result of synergetic action between H 2 O 2 and nitric/nitrous acid.…”

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confidence: 99%

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Retraction: Plasma Acid: Water Treated by Dielectric Barrier Discharge

Shainsky

Dobrynin

Ercan

et al. 2012

Plasma Processes & Polymers

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It is demonstrated that direct exposure of deionized water to a dielectric barrier discharge (DBD) plasma creates an acid (pH % 2) and is in fact, a strong oxidizer (providing, e.g., peroxidation of a cell membrane). This study addresses the question: which acid is created in water by plasma treatment. Two major possibilities are considered: nitric/nitrous acid and an acid which consist of a hydrogen cation (H þ ) and a superoxide anion (O À 2 ), which, for the lack of a better term, we call plasma acid. The presence of nitric/nitrous acid in the water after plasma treatment in air is confirmed, although the observed pH % 2 cannot be completely explained by the production of nitric acid. Moreover, experiments with oxygen-plasma treatment of water also lead to high acidity, without production of nitrogen based acids at all. Therefore, O À 2 , the conjugate base of the plasma acid, is at least partially responsible for both lowering of the pH and the increase in the oxidizing power of the solution. Experiments indicate that peroxides such as H 2 O 2 and O À 2 , together with an acidic environment are likely to be responsible for the oxidation properties of the plasma treated water. This plasma acid remains stable for at least a day, depending on the gas where plasma is generated, but the effect is temporal. Existence of a temporal and stable oxidizer created using the plasma treatment of pure water not only raises interesting scientific questions and possibilities, but is also likely to provide many applications in situations where direct plasma treatment may be difficult to achieve. Plasma Process. Polym. 2012,

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