Journal
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
Volume 303, Issue 1, Pages 919-924Publisher
SPRINGER
DOI: 10.1007/s10967-014-3501-7
Keywords
Plumbagin; Pulse radiolysis; Superoxide radical; Semiquinone radical anion; Lipid peroxyl; Tyrosyl radical
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Kinetics and mechanism of scavenging of reducing free radicals by plumbagin (5-hydroxy-2-methyl-1,4-naphthoquinone) are studied using pulse radiolysis technique. It scavenged superoxide radical, hydroxyethyl radical and hydrated electron with bimolecular rate constants of 8.9 x 10(7), 2.3 x 10(9) and 1.6 x 10(10) M-1 s(-1), respectively in aqueous-alcohol medium. Plumbagin also scavenged linoleic acid peroxyl radical and tyrosyl radical with bimolecular rate constants of 1.0 x 10(8) and 7.0 x 10(6) M-1 s(-1), respectively. Further, redox properties of plumbagin and its transients are studied using standard redox couples and cyclic voltammetry.
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