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Environmentally Persistent Free Radicals (EPFRs). 1. Generation of Reactive Oxygen Species in Aqueous Solutions
Open accessAbstract
Reactive oxygen species (ROS) generated by environmentally persistent free radicals (EPFRs) of 2-monochlorophenol, associated with CuO/silica particles, were detected using the chemical spin trap, 5,5-dimethyl-1-pyrroline-N-oxide (DMPO), in conjunction with electron paramagnetic resonance (EPR) spectroscopy. Yields of hydroxyl radical ((•)OH), superoxide anion radical (O(2)(•-)), and hydrogen peroxide (H(2)O(2)) generated by EPFR-particle systems were reported. Failure to trap superoxide radicals in aqueous solvent, formed from reaction of EPFRs with molecular oxygen, results from fast transformation of the superoxide to hydrogen peroxide. However, formation of superoxide as an intermediate product in hydroxyl radical formation in aprotic solutions of dimethyl sulfoxide (DMSO) and acetonitrile (AcN) was observed. Experiments with superoxide dismutase (SOD) and catalase (CAT) confirmed formation of superoxide and hydrogen peroxide, respectively, in the presence of EPFRs. The large number of hydroxyl radicals formed per EPFR and monotonic increase of the DMPO-OH spin adduct concentration with incubation time suggest a catalytic cycle of ROS formation.
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Cites
[1] Role of free radicals and catalytic metal ions in human disease: An overview
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Free Radical Generation at the Solid/Liquid Interface in Iron Containing Minerals
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Overview of the Alaskan Layered Pollution and Chemical Analysis (ALPACA) Field Experiment
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Metadata
- Authors
- Khachatryan, L., Vejerano, E., Lomnicki, S., & Dellinger, B.
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2011-09-15
- Volume
- 45
- Issue
- 19
- Pages
- 8559-8566
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W2032989692
- Cited by
- 397
- References
- 2
- FWCI
- 10.16
- Type
- journal article
- Language
- en
- Open access
- green
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