Journal of the Serbian Chemical Society 2011 Volume 76, Issue 4, Pages: 575-589
https://doi.org/10.2298/JSC100504042M
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Fabrication and characterization of molybdenum(VI)complex-TiO2 nanoparticles modified electrode for the electrocatalytic determination of L-cysteine
Mazloum-Ardakani Mohammad (Department of Chemistry, Faculty of Science, Yazd University, Yazd, I.R. Iran)
Beitollahi Hadi (Department of Chemistry, Faculty of Science, Yazd University, Yazd, I.R. Iran)
Taleat Zahra (Department of Chemistry, Faculty of Science, Yazd University, Yazd, I.R. Iran)
Salavati-Niasari Masoud (Department of Inorganic Chemistry, Faculty of Chemistry, University of Kashan, Kashan, I.R. Iran)
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/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 LCys. 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 M 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.
Keywords: L-Cysteine, TiO2 nanoparticles, carbon paste electrode, electrocatalysis