Formation of semiquinone radical anion and free radical scavenging reactions of plumbagin: a pulse radiolysis study

被引：2
|
作者：
Joshi, Ravi [1 ]
Gangabhagirathi, R. [2 ]
机构：
[1] Bhabha Atom Res Ctr, Radiat & Photochem Div, Bombay 400085, Maharashtra, India
[2] Bhabha Atom Res Ctr, Div Bioorgan, Bombay 400085, Maharashtra, India
来源：
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY | 2015年 / 303卷 / 01期
关键词：
Plumbagin; Pulse radiolysis; Superoxide radical; Semiquinone radical anion; Lipid peroxyl; Tyrosyl radical; ONE-ELECTRON REDUCTION; AQUEOUS-SOLUTION; ANTIOXIDANT PROPERTIES; ROS GENERATION; POTENTIALS; REACTIVITY; SUPEROXIDE; NAPHTHOQUINONES; UBIQUINONE; MECHANISM;
D O I：
10.1007/s10967-014-3501-7
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
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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页码：919 / 924
页数：6
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