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Electrocatalytic determination of L-cysteine using a modified carbon nanotube paste electrode:Application to the analysis of some real samples |
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| Authors: | Malihe Ahmadipour a b Mohammad Ali Taher a Hadi Beitollahi c Rahman Hosseinzadeh d a |
| Affiliation: | Department of Chemistry, Shahid Bahonar University of Kerman, P.O. Box 76175-133, Kerman, Iran ; Young Researchers Society, Shahid Bahonar University of Kerman, P.O. Box 76175-133, Kerman, Iran ; Environment Department, Research Institute of Environmental Sciences, International Center for Science, High Technology & Environmental Sciences, Kerman, Iran ; Department of Organic Chemistry, Faculty of Chemistry, University of Mazandaran, Babolsar, Iran |
| Abstract: | The electrooxidation of L-cysteine(L-Cys) was studied using a benzoylferrocene(BF) modified multi-wall carbon nanotube paste electrode(BFCNPE) using cyclic voltammetry(CV),square wave voltammetry(SWV) and chronoamperometry(CHA).Under optimum pH in CV the oxidation of L-Cys occurs at a potential about 215 mV less positive than that at the surface of unmodified carbon paste electrode.The catalytic oxidation peak currents were dependent on the L-Cys concentration and a linear calibration curve was obtained in the range 0.7-350.0 mmol/L of L-Cys with SWV method.The detection limit(3s) was determined as 0.1 mmol/L.This method was also used for the determination of L-Cys in some real samples. |
| Keywords: | L-Cysteine Carbon paste electrode Carbon nanotubes Voltammetry |
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