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Fabrication and characterization of molybdenum(VI) complex–TiO2 nanoparticles modified electrode for the electrocatalytic determination of L-cysteine

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Author(s): MOHAMMAD MAZLOUM-ARDAKANI | HADI BEITOLLAHI | ZAHRA TALEAT | MASOUD SALAVATI-NIASARI

Journal: Journal of the Serbian Chemical Society
ISSN 0352-5139

Volume: 76;
Issue: 4;
Start page: 575;
Date: 2011;
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Keywords: L-cysteine | TiO2 nanoparticles | carbon paste electrode | electrocatalysis

ABSTRACT
A novel voltammetric sensor for the determination of L-cysteine (L-Cys) was fabricated based on a TiO2 nanoparticles/bis[bis(salicylidene-1,4-phenylenediamine) molybdenum(VI)] carbon paste electrode. The electroche­mical behavior of the sensor was investigated in detail by cyclic voltammetry. The apparent electron transfer rate constant (ks) and charge transfer coefficient (α) of the TiO2 nanoparticles/molybdenum(VI) complex/carbon paste electrode (CPE) were also deter­mined by cyclic voltammetry and found to be about 4.53 s-1 and 0.54, respec­tively. The sensor displayed good electrocatalytic activity towards the oxi­dation of L-Cys. The peak potential for the oxidation of L-Cys was low­ered by at least 130 mV compared with that obtained at an unmodified CPE. Under optimal conditions, the linear range spans L-Cys concentrations from 1.5×10-6 to 1.2×10-3 M and the detection limit was 0.70±0.01 µM at a signal-to-noise ratio of 2. In addition, the sensor showed good stability and reproducibility.
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