Ionic liquid/multiwall carbon nanotubes paste electrode for square wave voltammetric determination of methyldopa

Ionics - Tập 19 - Trang 1163-1170 - 2012
Masoud Fouladgar1, Hassan Karimi-Maleh2
1Department of Biochemistry, Falavarjan Branch, Islamic Azad University, Falavarjan, Iran
2Department of Chemistry, Science and Research Branch, Islamic Azad University, Mazandaran, Iran

Tóm tắt

Ionic liquid/multiwall carbon nanotubes paste electrode has been used as a novel sensor for the efficient quantitative determination of methyldopa (MDOP) in pharmaceutical and biological samples by using square wave voltammetry. This new sensor shows a better electrochemical response with lower over-potential and high sensitivity for MDOP compared with unmodified carbon paste electrode in physiological condition. The electro-oxidation of MDOP occurred in a pH-dependent 2e− and 2H+ process, and the electrode reaction followed a diffusion-controlled pathway. Under the optimum conditions, the voltammetric oxidation peak current of MDOP showed two linear dynamic ranges with a detection limit of 0.1 μM for MDOP. The novel sensor has been found selective and successfully implemented for the determination of MDOP in real samples such as tablet and patient urine.

Tài liệu tham khảo

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Ionics

Tập 19

1163-1170

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