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Title
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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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Type
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JournalPaper
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Keywords
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L-Cysteine; Carbon paste electrode; Carbon nanotubes; Voltammetry
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Abstract
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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.
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Researchers
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Rahman Hosseinzadeh (Fourth Researcher), Hadi Beitollahi (Third Researcher), Mohammad Ali Taher (Second Researcher), Malihe Ahmadipour (First Researcher)
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