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

作者：Keyvanfard Mohsen^*; Salmani Mobarakeh Rasoul; Karimi Maleh Hassan; Alizad Khadijeh

来源：Chinese Journal of Catalysis, 2014, 35(7): 1166-1172.

DOI：10.1016/S1872-2067(14)60065-6

• L-Cysteine
• Multiwall carbon nanotube
• Voltammetry
• 3,4-Dihydroxycinnamic acid

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 x 10(2) mol(-1) L s(-1). The catalytic peak current was linearly dependent on the L-cysteine concentration in the range of 0.4-115 mu mol/L. The detection limit obtained by linear sweep voltammetry was 0.25 mu mol/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.

• 出版日期2014-7