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pharmaceutical and biological samples using modified multiwall carbon nanotubes paste electrode |
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| Authors: | Ali Taherkhani Hassan Karimi-Maleh Ali A Ensafi Hadi Beitollahi Ahmad Hosseini Mohammad A Khalilzadeh Hassan Bagheri |
| Institution: | Department of Physics, Takestan Branch, Islamic Azad University,Takestan, Iran Department of Chemistry, Majlesi Branch, Islamic Azad University, Isfahan, Iran Environmet Department, Research Institute of Environmental Sciences, International Center for Science, High Technology and Environmental Sciences, Kerman, Iran Department of Chemistry, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Iran Department of Chemisty, Takestan Branch, Islamic Azad University,Takestan, Iran |
| Abstract: | A carbon paste electrode (CPE) chemically modified with multiwall carbon nanotubes and ferrocene (FC) was used as a selective electrochemical sensor for the simultaneous determination of trace amounts of cysteamine (CA) and folic acid (FA). This modified electrode showed very efficient electrocatalytic activity for the anodic oxidation of CA. The peaks current of differential pulse voltammograms of CA and FA increased linearly with their concentration in the ranges of 0.7–200 µmol/L CA and 5.0–700 µmol/L FA. The detection limits for CA and FA were 0.3 µmol/L and 2.0 µmol/L, respectively. The diffusion coefficient (D) and transfer coefficient (α) of CA were also determined. These conditions are sufficient to allow determination of CA and FA both individually and simultaneously. |
| Keywords: | Cysteamine Folic acid Carbon nanotubes paste electrode Voltammetry |
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