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Citation: ZHANG Ya, QIAO Guang-Jun, ZHANG Hong-Fang, ZHENG Jian-Bin. Electrocatalysis of Baicalin at Ionic Liquid Modified Carbon Paste Electrode and Its Analytical Application[J]. Chinese Journal of Applied Chemistry, ;2008, 25(8): 899-903. shu

Electrocatalysis of Baicalin at Ionic Liquid Modified Carbon Paste Electrode and Its Analytical Application

1.
Institute of Analytical Science, Shaanxi Provincial Key Laboratory of Electroanalytical Chemistry, Northwest University, Xi'an 710069

Corresponding author: ZHENG Jian-Bin,
Received Date: 2 August 2007
Available Online: 28 October 2007
Fund Project: 国家自然科学基金(20675062)资助项目 (20675062)

An ionic liquid modified carbon paste electrode(IL/CPE) was fabricated with hydrophilic ionic liquid 1-amyl-3-methylimidazolium chloride([AMIM]Cl) as a modifier. The electrochemical behavior of baicalin at the modified electrode and bare carbon paste electrode(CPE) was investigated in a Britton-Robinson(B-R) buffer solution(pH=3.53) by cyclic voltammetry(CV) and square wave voltammetry(SWV), and a novel method for the determination of baicalin in urine and serum samples was thus established. At CPE, the peak-to-peak potential separation(ΔE_p) of baicalin was 0.204 V, while at IL/CPE, the Ep decreased to 0.103 V. Furthermore, the current response of baicalin at IL/CPE was 7.1 times of that at CPE. These indicated the IL/CPE possessed an excellent electrocatalytic activity for the redox of baicalin. The electron transfer coefficient and standard rate constant of baicalin at IL/CPE were calculated. In the SWV curves, a linear dependence of oxidation current on baicalin concentration was obtained in the range of 1.0×10^-8~2.0×10^-6 mol/L(r=0.999 8), with a detection limit of 3.0×10^-9 mol/L(S/N=3). The relative standard deviation of 4.0×10^-7 mol/L baicalin was 1.3% for 6 consective measurements.
- voltammetry,
- electrocatalysis,
- ionic liquid,
- carbon paste electrode,
- baicalin
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