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UV-vis spectroscopy study of plasma-activated water: dependence of the chemical composition on plasma exposure time and treatment distance

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dc.contributor.authorOh, J.S.
dc.contributor.authorSzili, E.J.
dc.contributor.authorOgawa, K.
dc.contributor.authorShort, R.D.
dc.contributor.authorIto, M.
dc.contributor.authorFuruta, H.
dc.contributor.authorHatta, A.
dc.date.issued2018
dc.description.abstractPlasma-activated water ( PAW) is receiving much attention in biomedical applications because of its reported potent bactericidal properties. Reactive oxygen and nitrogen species (RONS) that are generated in water upon plasma exposure are thought to be the key components in PAW that destroy bacterial and cancer cells. In addition to developing applications for PAW, it is also necessary to better understand the RONS chemistry in PAW in order to tailor PAW to achieve a specific biological response. With this in mind, we previously developed a UV-vis spectroscopy method using an automated curve fitting routine to quantify the changes in H2O2, NO2 %, NO3 % (the major long-lived RONS in PAW), and O-2 concentrations. A major advantage of UV-vis is that it can take multiple measurements during plasma activation. We used the UV-vis procedure to accurately quantify the changes in the concentrations of these RONS and O-2 in PAW. However, we have not yet provided an in-depth commentary of how we perform the curve fitting procedure or its implications. Therefore, in this study, we provide greater detail of how we use the curve fitting routine to derive the RONS and O-2 concentrations in PAW. PAW was generated by treatment with a helium plasma jet. In addition, we employ UV-vis to study how the plasma jet exposure time and treatment distance affect the RONS chemistry and amount of O-2 dissolved in PAW. We show that the plasma jet exposure time principally affects the total RONS concentration, but not the relative ratios of RONS, whereas the treatment distance affects both the total RONS concentration and the relative RONS concentrations. (C) 2018 The Japan Society of Applied Physics
dc.identifier.citationJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, 2018; 57(1):1-10
dc.identifier.doi10.7567/JJAP.57.0102B9
dc.identifier.issn0021-4922
dc.identifier.issn1347-4065
dc.identifier.urihttps://hdl.handle.net/11541.2/129857
dc.language.isoen
dc.publisherIOP Publishing Ltd
dc.relation.fundingKochi University of Technology
dc.relation.fundingJSPS KAKENHI JP17K05099
dc.relation.fundingMEXT-Supported Program for the Strategic Research Foundation at Private Universities S1511021
dc.relation.fundingproject for Promoting Research Center in Meijo University
dc.relation.fundingARC DP16010498
dc.rightsCopyright 2018 The Japan Society of Applied Physics Access Condition Notes: This article is free to read online
dc.source.urihttps://doi.org/10.7567/JJAP.57.0102B9
dc.subjectUV–vis spectroscopy
dc.subjectplasma-activated water
dc.subjectplasma exposure time
dc.subjecttreatment distance
dc.titleUV-vis spectroscopy study of plasma-activated water: dependence of the chemical composition on plasma exposure time and treatment distance
dc.typeJournal article
pubs.publication-statusPublished
ror.mmsid9916168009301831

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