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Selective Voltammetric Detection of Uric Acid in the Presence of Ascorbic Acid at Well-Aligned Carbon Nanotube Electrode

✍ Scribed by Jian-Shan Ye; Ying Wen; Wei De Zhang; Leong Ming Gan; Guo Qin Xu; Fwu-Shan Sheu

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
130 KB
Volume
15
Category
Article
ISSN
1040-0397

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✦ Synopsis

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 (3__δ__) 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.

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