期刊
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
卷 11, 期 12, 页码 10939-10952出版社
ESG
DOI: 10.20964/2016.12.86
关键词
L-Cysteine; Ru(III) Schiff base complex; multi-wall carbon nanotubes; modified glassy carbon and screen printed carbon electrodes; voltammetric and amperometric determination
资金
- team CEEPUS [CIII-CZ-0212-08-1415]
A new low potential electrochemical sensor for determination of L-cysteine based on carbon electrodes modified with Ru(III) Schiff base complex, multi-walled carbon nanotubes and Nafion is presented. Cyclic voltammetry, differential pulse voltammetry and flow injection analysis were employed. Measurements were carried out using Britton-Robinson buffer (pH 5.50). The results showed that addition of multi-walled carbon nanotubes to Ru(III) complex modified glassy carbon and screen printed carbon electrodes gives increased current signals at the potential where oxidation of L-cysteine occurs. Flow injection amperometric measurements were performed at the operating potential +0.15 V vs. Ag/AgCl (3 M KCl) electrode and showed fast electric current response for L-cysteine oxidation, demonstrating good reproducibility and stability. The sensor has a detection limit of 0.11 mg L-1 and a dynamic range of 50-500 mg L-1. The repeatability was calculated as 2.8 %. New sensor was used for the determination of L-cysteine in pharmaceutical products.
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