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Voltammetric Determination of Homocysteine Using Multiwall Carbon Nanotube Paste Electrode in the Presence of Chlorpromazine As a Mediator Publisher



Gholamiorimi F1 ; Taleshi F2 ; Biparva P3 ; Karimimaleh H4 ; Beitollahi H5 ; Ebrahimi HR6 ; Shamshiri M7 ; Bagheri H8 ; Fouladgar M9 ; Taherkhani A10
Authors

Source: Journal of Analytical Methods in Chemistry Published:2012


Abstract

We propose chlorpromazine (CHP) as a new mediator for the rapid, sensitive, and highly selective voltammetric determination of homocysteine (Hcy) using multiwall carbon nanotube paste electrode (MWCNTPE). The experimental results showed that the carbon nanotube paste electrode has a highly electrocatalytic activity for the oxidation of Hcy in the presence of CHP as a mediator. Cyclic voltammetry, double potential step chronoamperometry, and square wave voltammetry (SWV) are used to investigate the suitability of CHP at the surface of MWCNTPE as a mediator for the electrocatalytic oxidation of Hcy in aqueous solutions. The kinetic parameters of the system, including electron transfer coefficient, and catalytic rate constant were also determined using the electrochemical approaches. In addition, SWV was used for quantitative analysis. SWV showed wide linear dynamic range (0.1-210.0M Hcy) with a detection limit of 0.08M Hcy. Finally, this method was also examined as a selective, simple, and precise electrochemical sensor for the determination of Hcy in real samples. Copyright 2012 Fathali Gholami-Orimi et al.