Slow molecular transport of plasma-generated reactive oxygen and nitrogen species and O2 through agarose as a surrogate for tissue

Oh, Jun Seok and Szili, Endre J. and Ito, Satsuki and Hong, Sung Ha and Gaur, Nishtha and Furuta, Hiroshi and Short, Robert D. and Hatta, Akimitsu (2015) Slow molecular transport of plasma-generated reactive oxygen and nitrogen species and O2 through agarose as a surrogate for tissue. Plasma Medicine, 5 (2-4). pp. 125-143. ISSN 1947-5764

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Abstract

The helium (He) atmospheric-pressure plasma jet (APPJ) delivery of reactive oxygen and nitrogen species (RONS) and molecular oxygen (O2) in deionized (DI) water was monitored in real time using in situ UV absorption spectroscopy. The He APPJ was used to treat DI water directly and through an agarose target as a surrogate for tissue (e.g., a skin barrier). For direct treatment, the RONS were generated immediately in the DI water, and the concentration of RONS continued to increase during the He APPJ treatment. But there was only a very minor increase in the total RONS concentration detected after the plasma and gas flow were switched off. The agarose target delayed the generation of RONS into the DI water, but the total RONS concentration continued to increase long after (25 min) the plasma and gas flow were switched off. Direct treatment deoxygenated the DI water, whereas treatment through agarose resulted in oxygenation of the DI water. A dynamic change in the ratio of H2O2, NO2 -, NO3 -, and O2 was detected in the DI water during He APPJ treatment and 25 min after the He and gas flow were switched off for both direct and through-agarose treatment. These results have implications for the plasma treatment of real tissue where the dynamic changes in the RONS and O2 concentrations within the tissue and tissue fluid could affect cellular and physiological processes.

Item Type:
Journal Article
Journal or Publication Title:
Plasma Medicine
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100
Subjects:
ID Code:
135140
Deposited By:
Deposited On:
08 Jul 2019 14:40
Refereed?:
Yes
Published?:
Published
Last Modified:
13 May 2020 06:31