Application of 3,4-dihydroxycinnamic acid as a suitable mediator and multiwall carbon nanotubes as a sensor for the electrocatalytic determination of L-cysteine

doi:10.1016/S1872-2067(14)60065-6

Abstract

Abstract:

A highly sensitive electrochemical sensor was prepared for the determination of L-cysteine using a modified multiwall carbon nanotubes paste electrode in the presence of 3,4-dihydroxycinnamic acid (3,4-DHCA) as a mediator, based on an electrocatalytic process. The results indicate that the electrode is electrocatalytically efficient for the oxidation of L-cysteine in the presence of 3,4-DHCA. The interaction between the mediator and L-cysteine can be used for its sensitive and selective determination. Using chronoamperometry, the catalytic reaction rate constant was calculated to be 2.37×10² mol^-1 L s^-1. The catalytic peak current was linearly dependent on the L-cysteine concentration in the range of 0.4-115 μmol/L. The detection limit obtained by linear sweep voltammetry was 0.25 μmol/L. Finally, the modified electrode was examined as a selective, simple, and precise new electrochemical sensor for the determination of L-cysteine in real samples.

Key words: L-Cysteine, Multiwall carbon nanotube, Voltammetry, 3,4-Dihydroxycinnamic acid

Mohsen Keyvanfard, Rasoul Salmani-mobarakeh, Hassan Karimi-Maleh, Khadijeh Alizad. Application of 3,4-dihydroxycinnamic acid as a suitable mediator and multiwall carbon nanotubes as a sensor for the electrocatalytic determination of L-cysteine[J]. Chinese Journal of Catalysis, 2014, 35(7): 1166-1172.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(14)60065-6

https://www.cjcatal.com/EN/Y2014/V35/I7/1166

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