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Electrochemically driven derivatisation-detection of cysteine

White, PC, Lawrence, NS, Tsai, YC, Davis, J and Compton, RG (2001) Electrochemically driven derivatisation-detection of cysteine. MIKROCHIMICA ACTA, 137 (1-2). pp. 87-91. [Journal article]

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The electrochemical oxidation of catechol to ortho quinone at a glassy carbon electrode in the presence of cysteine is shown to lead to the deposition of a quinone-cysteine adduct at the electrode surface. Square wave voltammetry is shown to enable voltammetric resolution of unreacted orthoquinone and the accumulated adduct species such that quantification of both species is possible over a range of pH 2-pH 6. The reaction is shown to be selective towards cysteine with little interference from cystine, homocysteine or glutathione. The foundations of a detection protocol are reported with the sensitivity shown to be capable of attenuation through the facile manipulation of the number of electro-initiated derivatisation scans. The application of six consecutive derivatisation scans is shown to provide a linear range of 2-20 muM cysteine that is well within the region required for physiological monitoring.

Item Type:Journal article
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:14372
Deposited By: Professor James Davis
Deposited On:01 Jul 2010 08:51
Last Modified:18 Aug 2011 10:19

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