Laser flash photolysis study on the oxidation of methionine by SO4 center dot- in aqueous solution

Authors
Chu, GS Ge, XW Chen, JF Yao, SD Zhang, ZC
Citation
Gs. Chu et al., Laser flash photolysis study on the oxidation of methionine by SO4 center dot- in aqueous solution, RADIAT PH C, 54(5), 1999, pp. 449-453
Citations number
13
Categorie Soggetti
Physics
Journal title
RADIATION PHYSICS AND CHEMISTRY
ISSN journal
0969806X → ACNP
Volume
54
Issue
5
Year of publication
1999
Pages
449 - 453
Database
ISI
SICI code
0969-806X(199905)54:5<449:LFPSOT>2.0.ZU;2-Y
Abstract
Using the technique of laser flash photolysis, it has been demonstrated tha t the interaction of SO4.-. with methionine in aqueous solution at pH 1.0-7 .0 results in the formation of the H abstraction radicals Met(-H) . and the dimer of three-electron-bonded radical cations Met(2.)(-) [S] with maximum absorption at 300 and 480 nm respectively. The characteristic absorption a t 480 nm completely disappeared at pH > 7.0. The mechanism has been deduced and the kinetic parameters have been determined. (C) 1999 Elsevier Science Ltd. All rights reserved.