Sarkar, Papiya and Saha, Amrita and Chatterjee, Debabrata (2016) [RuIII(EDTA)(H2O)]- mediated oxidation of cellular thiols by HSO5-. New Journal of Chemistry, 40 (11). pp. 9380-9384.

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Abstract

The [RuIII(EDTA)(H2O)]- (EDTA4-= ethylenediaminetetraacetate) complex is shown to mediate the oxidation of thiols, RSH (RSH = cysteine, glutathione, N-acetylcysteine, and penicillamine), with peroxomonosulfate ion (HSO5-). The kinetics of the catalytic oxidation process were studied using toppedflow and rapid scan spectrophotometry as a function of [RuIII(EDTA)(H2O)-], [HSO5-], and [RSH] at a constant pH (6.2). Spectral analyses and kinetic data are suggestive of a catalytic pathway in which the RSH reacts with the [RuIII(EDTA)] catalyst complex to form [RuIII(EDTA)(SR)]2- intermediate species. In a subsequent step the HSO5- ion reacts directly with the coordinated S-atom of [RuIII(EDTA)(SR)]2- yielding the disulfido species, RSSR, as a major oxidation product (as identified using HPLC and ESI-MS analyses) under the employed conditions. Based on the experimental data, a working mechanism is proposed for the [RuIII(EDTA)] catalyzed oxidation of thiols.

Item Type:	Article
Subjects:	Chemistry
Depositing User:	Dr. Sarita Ghosh
Date Deposited:	09 Jun 2017 11:40
Last Modified:	09 Jun 2017 11:40
URI:	http://cmeri.csircentral.net/id/eprint/342

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