New modified multiwalled carbon nanotubes paste electrode for electrocatalytic oxidation and determination of warfarin in biological and pharmaceutical samples

doi:10.1016/S1872-2067(15)61039-7

Abstract

Abstract:

A novel sensor for the determination of warfarin based on a simple and sensitive method was developed on multiwalled-carbon-nanotube modified ZnCrFeO₄ carbon paste electrodes (MWCNT/ZnCrFeO₄/CPEs). Cyclic voltammetry, differential pulse voltammetry, chronoamperometry, and electrochemical impedance spectroscopy were used to investigate the electrochemical behavior of warfarin at the chemically modified electrode. According to the results, MWCNT/ZnCrFeO₄/CPEs showed high electrocatalytic activity for warfarin oxidation, producing a sharp oxidation peak current at about +0.97 vs Ag/AgCl reference electrode at pH = 4.0. The peak current was linearly dependent on warfarin concentration over the range of 0.02-920.0 μmol/L with a detection limit of 0.003 μmol/L. In addition, chronoamperometry was also used to determine warfarin's catalytic rate constant and diffusion coefficient at MWCNT/ZnCrFeO₄/CPEs.

Key words: ZnCrFeO₄Multiwalled carbon nanotubes, Warfarin, Electrochemical impedance spectroscopy, Paste electrode

Masoumeh Taei, Fardin Abedi. New modified multiwalled carbon nanotubes paste electrode for electrocatalytic oxidation and determination of warfarin in biological and pharmaceutical samples[J]. Chinese Journal of Catalysis, 2016, 37(3): 436-445.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(15)61039-7

https://www.cjcatal.com/EN/Y2016/V37/I3/436

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