Electrochemical Oxidation of Methionine Mediated by a Fullerene-C60 Modified Gold Electrode

Tan, Wee Tee and Goh, Joo Kheng (2008) Electrochemical Oxidation of Methionine Mediated by a Fullerene-C60 Modified Gold Electrode. Electroanalysis, 20 (22). pp. 2447-2453. ISSN 1040-0397

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Official URL: http://dx.doi.org/10.1002/elan.200704335

Abstract

The usefulness of a C60-fullerene modified gold (Au) electrode in mediating the oxidation of methionine in the presence of potassium ions electrolyte has been demonstrated. During cyclic voltammetry, an oxidation peak of methionine appearing at þ1.0 V vs. Ag/AgCl was observed. The oxidation current of methionine is enhanced by about 2 times using a C60 modified gold electrode. The current enhancement is significantly dependent on pH, temperature and C60 dosage. Calibration plot reveals linearity of up to 0.1 mM with a current sensitivity of close to 50 mA L mol1 and detection limit of 8.2106 M. The variation of scan rate study shows that the system undergoes diffusion-controlled process. Diffusion coefficient and rate constant of methionine were determined using hydrodynamicmethod(rotating disk electrode) with values of 1.11105 cm2 s1 and 0.0026 cm s1 respectively for unmodified electrode while the values of diffusion coefficient and rate constant of methionine using C60 modified Au electrode are 5.7106 cm2 s1 and 0.0021 cm s1 respectively

Item Type:Article
Keyword:C60 modified Au electrode, Voltammetry, Methionine analysis, Electrocatalysis
Faculty or Institute:Faculty of Science
Publisher:Wiley Blackwell
DOI Number:10.1002/elan.200704335
Altmetrics:http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1002/elan.200704335
ID Code:6146
Deposited By: Najwani Amir Sariffudin
Deposited On:12 May 2010 08:50
Last Modified:21 Jul 2010 10:06

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