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Ramasarma, T. and Ravishankar, H.N. (2005) Formation of an oxo-radical of peroxovanadate during reduction of diperoxovanadate with vanadyl sulfate or ferrous sulfate. Biochimica et Biophysica Acta (BBA) - General Subjects, 1722 (1). pp. 30-35. ISSN 0304-4165

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Abstract

Formation of oxygen radicals during reduction of H(2)O(2) or diperoxovanadate with vanadyl sulfate or ferrous sulfate was indicated by the 1:2:2:1 electron spin resonance (ESR) signals of the DMPO adduct typical of standard ()OH radical. Signals derived from diperoxovanadate remained unchanged in the presence of ethanol in contrast to those from H(2)O(2). This gave the clue that they represent a different radical, possibly (*)OV(O(2))(2+), formed on breaking a peroxo-bridge of diperoxovanadate complex. The above reaction mixtures evolved dioxygen or, when NADH was present, oxidized it rapidly which was accompanied by consumption of dioxygen. Operation of a cycle of peroxovanadates including this new radical is suggested to explain these redox activities both with vanadyl and ferrous sulfates. It can be triggered by ferrous ions released from cellular stores in the presence of catalytic amounts of peroxovanadates.

Item Type: Article
Depositing User: Dr P Divakar
Date Deposited: 26 Jun 2015 06:28
Last Modified: 01 Sep 2017 07:52
URI: http://cdfd.sciencecentral.in/id/eprint/194

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