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Citation: LUO Ji-Wen, ZHANG Zhi-Ling, LI Jia-Zhou, HUANG Zhi-Wei, LI Jia-Gui, CHEN Yuan. Electro-catalytic Oxidation of L-cysteine at Single-wall Carbon Nanotube Modified Glassy Carbon Electrode and Its Analytical Application[J]. Chinese Journal of Applied Chemistry, ;2005, 22(11): 1239-1243. shu

Electro-catalytic Oxidation of L-cysteine at Single-wall Carbon Nanotube Modified Glassy Carbon Electrode and Its Analytical Application

1.
a Department of Chemistry and Biology, Yulin Normal College, Yulin 537000;
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b College of Chemistry and Molecular Sciences, Wuhan University, Wuhan

Corresponding author: LUO Ji-Wen,
Received Date: 23 December 2004
Available Online: 26 April 2005
Fund Project:

The electrocatalytic activity of single-wall carbon nanotube(SWNT) modified glassy carbon electrode(GCE) toward the oxidation of L-cysteine(L-Cys) was investigated.L-Cys produces an irreversible oxidation peak at 0.54 V(vs.SCE) in a phosphate buffer(PBS) of pH=7.0.The peak potential is much lower than that at a bare GCE.The peak current is proportional to the concentration of L-Cys in the range of 2.0×10^-6~3.0×10^-4 mol/L with a detection limit of 5.5×10^-7 mol/L by means of cyclic voltammetry at the SWNT modified electrode.The relative standard deviation is 3.2% for solution containing 0.10 mmol/L(L-Cys)(n=7).The modified electrode has been satisfactorily used for the determination of amino acid injection samples in pharmaceutical formulations.The recoveries are in the range of 94%~97%.
- L-cysteine,
- single-wall carbon nanotube,
- chemically modified electrode,
- electrocatalytic oxidation
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