Fluorescence measurements of peroxynitrite/peroxynitrous acid in cold air plasma treated aqueous solutions

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F19%3A00518274" target="_blank" >RIV/61389021:_____/19:00518274 - isvavai.cz</a>

Result on the web

<a href="https://pubs.rsc.org/en/content/articlelanding/2019/CP/C9CP00871C#!divAbstract" target="_blank" >https://pubs.rsc.org/en/content/articlelanding/2019/CP/C9CP00871C#!divAbstract</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/c9cp00871c" target="_blank" >10.1039/c9cp00871c</a>

Result language

angličtina

Original language name

Fluorescence measurements of peroxynitrite/peroxynitrous acid in cold air plasma treated aqueous solutions

Original language description

Qualitative detection of peroxynitrite/peroxynitrous acid (ONOO-/ONOOH) as one of the key bactericidal agents produced in cold air plasma activated aqueous solutions is presented. We examined the use of the 2,7-dichlorodihydrofluorescein diacetate (H(2)DCFDA) fluorescent dye to detect ONOO-/ONOOH in plasma activated non-buffered water (PAW) or buffered solution (PAPB) generated by DC-driven self-pulsed transient spark discharge at atmospheric pressure in ambient air. The diagnostic selectivity of H(2)DCFDA to reactive oxygen and nitrogen species (RONS) typical of plasma activated aqueous solutions was examined by using various scavengers of RONS. This cross-reactivity study showed the highest sensitivity of the H(2)DCFDA dye to ONOO-/ONOOH. However, besides ONOO-/ONOOH, H(2)DCFDA also exhibited sensitivity to hypochlorite anions/hypochlorous acid (OCl-/HOCl), showing that for a selective study it is important to have an idea about the possible constituents in the studied solutions. The sensitivity of H(2)DCFDA to other RONS even in much higher concentrations was negligible. The presence of nitrites (NO2-) and hydrogen peroxide (H2O2) in PAW led predominantly to the production of peroxynitrous acid with a strong fluorescence response of H(2)DCFDA in PAW. Plasma treatment of buffered solutions led to the weak response of H(2)DCFDA. The fluorescence induced in PAW decreased after scavenging individual reactants, namely NO2- and H2O2, as well as by scavenging the product of the peroxynitrite forming reaction, proving that the fluorescence response of H(2)DCFDA is primarily due to the formation of ONOO-/ONOOH. A chemical kinetics analysis of post-discharge processes and the pseudo-second order reaction between H2O2 and NO2- confirms formation of peroxynitrous acid in PAW with a rate in the order of tens of nM per second. The post-discharge evolution of the ONOOH formation rate was clearly correlated with the parallel detection of ONOO-/ONOOH by fluorescence spectroscopy using the H(2)DCFDA dye.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

<a href="/en/project/GA19-25026S" target="_blank" >GA19-25026S: Characteristics of chemically reactive liquids produced by non-equilibrium plasma</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physical chemistry chemical physics : PCCP

ISSN

1463-9084

e-ISSN

—

Volume of the periodical

21

Issue of the periodical within the volume

17

Country of publishing house

GB - UNITED KINGDOM

Number of pages

14

Pages from-to

8883-8896

UT code for WoS article

000474599300025

EID of the result in the Scopus database

2-s2.0-85065202066