期刊
ANALYTICA CHIMICA ACTA
卷 512, 期 1, 页码 121-124出版社
ELSEVIER
DOI: 10.1016/j.aca.2004.02.020
关键词
ESR; spin-trapping; DMPO; hydroxyl radical; fenton reaction
The spin-trapping method has been widely accepted to measure the hydroxyl radical scavenging activity in electron spin resonance (ESR) spectroscopy, however, the disappearance of the trapped signal of the 5,5-dimethyl-1-pyrroline N-oxide (DMPO)-OH radical may lead to an erroneous conclusion, as the decreased signal must result from the rapid quenching of the DMPO-OH formed. The DMPO-OH quenching activity of a compound can be measured by tracing the signal decay resulting from its addition after the cessation of DMPO-OH formation. It was found that Fe(II) ions could quench the DMPO-OH radical quite rapidly, and phosphate ions could enhance the DMPO-OH radical quenching activity of the Fe(II) ions. (C) 2004 Elsevier B.V. All rights reserved.
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