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Title: Selective Voltammetric Detection of Uric Acid in the Presence of Ascorbic Acid at Well-Aligned Carbon Nanotube Electrode
Authors: Ye, J.-S. 
Wen, Y.
Zhang, W.D.
Gan, L.M. 
Xu, G.Q. 
Sheu, F.-S. 
Keywords: Carbon nanotubes
L-Ascorbic acid
Uric acid
Issue Date: Nov-2003
Citation: Ye, J.-S., Wen, Y., Zhang, W.D., Gan, L.M., Xu, G.Q., Sheu, F.-S. (2003-11). Selective Voltammetric Detection of Uric Acid in the Presence of Ascorbic Acid at Well-Aligned Carbon Nanotube Electrode. Electroanalysis 15 (21) : 1693-1698. ScholarBank@NUS Repository.
Abstract: The voltammetric behaviors of uric acid (UA) and L-ascorbic acid (L-AA) were studied at well-aligned carbon nanotube electrode. Compared to glassy carbon, carbon nanotube electrode catalyzes oxidation of UA and L-AA, reducing the overpotentials by about 0.028 V and 0.416 V, respectively. Based on its differential catalytic function toward the oxidation of UA and L-AA, the carbon nanotube electrode resolved the overlapping voltammetric response of UA and L-AA into two well-defined voltammetric peaks in applying both cyclic voltammetry (CV) and differential pulse voltammetry (DPV), which can be used for a selective determination of UA in the presence of L-AA. The peak current obtained from DPV was linearly dependent on the UA concentration in the range of 0.2 μM to 80 μM with a correlation coefficient of 0.997. The detection limit (36) for UA was found to be 0.1 μM. Finally, the carbon nanotube electrode was successfully demonstrated as a electrochemical sensor to the determination of UA in human urine samples by simple dilution without further pretreatment.
Source Title: Electroanalysis
ISSN: 10400397
DOI: 10.1002/elan.200302752
Appears in Collections:Staff Publications

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