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Citation: YOU Wei, ZHENG Zhi-Xiang, GAO Zuo-Ning. Electrochemical Behavior of Lisinopril at Carbon Paste Electrode and Its Electroanalytical Application[J]. Chinese Journal of Applied Chemistry, ;2008, 25(5): 578-582. shu

Electrochemical Behavior of Lisinopril at Carbon Paste Electrode and Its Electroanalytical Application

1.
Key Laboratory of Energy Sources and Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021

Corresponding author: GAO Zuo-Ning,
Received Date: 23 May 2007
Available Online: 30 July 2007
Fund Project: 宁夏高等学校科学研究基金(200623) (200623)宁夏大学自然科学基金(ZR0641)资助项目 (ZR0641)

Electrochemical behavior and electrochemical kinetic parameters of LSP at carbon paste electrode (CPE) were investigated by cyclic voltammetry (CV),chronoamperometry (CA),and chronocoulometry (CC).Electrochemical experimental results showed that LSP in 0.10 mol/L PBS exhibited an irreversible electrochemical redox process at CPE,and the oxidation peak potential (E_pa) was 0.956 V.The plots of oxidation peak current versus the square root of the scanning rate for the redox in a potential range of 10~1 000 mV/s were linear,as expected for a diffusion-limited electrochemical process for LSP electrochemical oxidation.Electron transfer coefficient α,diffusion coefficient D,and apparent reaction rate constant k_f were 0.77,2.47×10^-5 cm²/s and 3.46×10^-3 cm/s,respectively.The chang of the oxidation peak current with LSP concentration was examined by Square wave voltammetry (SWV).The oxidation peak current of LSP versus its concentration showed a good linear relationship in a concentration range of 1.0×10^-6~5.6×10^-3 mol/L with a correlation coefficient of 0.999 8 and a detection limit of 5.0×10^-7 mol/L by SWV response.The relative standard deviation was between 1.9%~2.3%,and the recovery was in a range of 98%~102%.The proposed method were applied to the determination of LSP in capsule samples with satisfied results.
- Lisinopril,
- carbon paste electrode,
- electrochemistry,
- electroanalysis
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