Voltammetric Determination of L-Cysteine at Cyclodextrin-incorporated Carbon Nanotubes Modified Electrode

Abstract

Abstract: A novel modified electrode was constructed by casting α-cyclodextrin-incorporated carbon nanotubes on graphite surface to form a functionalized interfacial layer. The modified electrode exhibits an excellent electrocatalytic activity for the oxidation of L-cysteine. The currents(measured by different pulse voltammetric techniques) increase linearly with the increase of the concentration of L-cysteine in the range from 1×10^-6 to₂×10^-3 mol/L. The detection limit is 2×10^-7 mol/L. The modified electrode has the best properties of the two components of the system, such as the electrocatalytic properties of carbon nanotubes and the molecular recognition and accumulation abilities of α-cyclodextrin. The result demonstrates that it has a good stability and reproducibility and is available in the detection of L-cysteine in urine.

Key words: L-Cysteine, Carbon nanotube, α-Cyclodextrin, Voltammetric determination

CLC Number:

O657

TrendMD:

XIAO Su-Fang, WANG Zong-Hua, LUO Guo-An, WANG Yi-Ming . Voltammetric Determination of L-Cysteine at Cyclodextrin-incorporated Carbon Nanotubes Modified Electrode[J]. Chem. J. Chinese Universities, 2004, 25(10): 1833.

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Voltammetric Determination of L-Cysteine at Cyclodextrin-incorporated Carbon Nanotubes Modified Electrode

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