Electroanalytical exploitation of nitroso phenyl modified carbon-thiol interactions: application to the low voltage determination of thiols

Abiman, P, Wildgoose, GG and Compton, RG (2007) Electroanalytical exploitation of nitroso phenyl modified carbon-thiol interactions: application to the low voltage determination of thiols. Electroanalysis, 19. pp. 437-444. ISSN 1040-0397

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Abstract

The electrochem. generation of nitrosophenyl groups covalently attached to graphite powder (nitrosophenylcarbon) from carbon powder chem. modified with nitrophenyl groups and their subsequent reaction with thiols (glutathione, cysteine and homocysteine) has been investigated as a method by which the later can be quantified. The modified carbon powder was immobilized onto a basal plane pyrolytic graphite electrode and characterized by cyclic voltammetry by scanning between 1.0 V and -1.0 V vs. SCE in phosphate buffer (pH 7). Square wave voltammetry (SWV) was used for the detn. of thiols and the SWV parameters were optimized. The nitrosophenylcarbon is electrogenerated from nitrophenylcarbon and can chem. oxidize thiols to disulfides. Subsequent redn. of nitrosophenylcarbon to phenylhydroxylaminecarbon during the square wave voltammetric process leads to a decrease in the reductive current. This can be correlated to the concn. of thiol present within the medium. The cyclic voltammetric responses of basal plane pyrolytic graphite electrode, edge plane pyrolytic graphite electrode, glassy carbon electrode and boron-doped diamond electrode in the direct oxidn. of thiols were also investigated and all were found to have a significantly higher overpotential compared to the described method using nitrosophenylcarbon. [on SciFinder(R)]

Item Type: Article
Uncontrolled Keywords: electroanalysis redox mediation thil detection modified carbon electrode
Faculty \ School: Faculty of Science > School of Chemistry
Depositing User: Rachel Smith
Date Deposited: 21 Jun 2011 15:24
Last Modified: 21 Apr 2020 19:16
URI: https://ueaeprints.uea.ac.uk/id/eprint/33017
DOI: 10.1002/elan.200603744

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