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Electrocatalytic oxidation of thioglycolic acid at carbon paste electrode modified with cobalt phthalocyanine: Application as a potentiometric sensor

Shahrokhian, S ; Sharif University of Technology | 2003

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  1. Type of Document: Article
  2. DOI: 10.1016/S0013-4686(03)00582-6
  3. Publisher: 2003
  4. Abstract:
  5. The voltammetric behavior of thioglycolic acid (TGA) was studied at a carbon paste electrode modified with cobalt phthalocyanine (CoPc). The CoPc-modified electrode shows high electrocatalytic activity toward oxidation of TGA, lowering substantially the overpotential of anodic reaction. Results of the cyclic voltammetry show that TGA undergoes a two-step oxidation (each step with one electron) resulting the dimer of thiol. Enhancement of the rate of electron transfer results in a near-Nernstian behavior of modified electrode to the concentration of TGA and makes it as a suitable potentiometric sensor for the detection of this compound. This electrode shows a near-Nernstian response in a wide linear range of the concentration TGA (∼4 orders of magnitude). The modified electrode was used successfully for the determination of TGA and its salts in hair-treatment products and also in culture media. The modified electrode exhibited a fast response time (<10s), very good stability, and had an extended lifetime. © 2003 Elsevier Ltd. All rights reserved
  6. Keywords:
  7. Cyclic voltammetry (CV) ; Electrocatalysis ; Modified electrode ; Potentiometry ; Thioglycolic acid (TGA)
  8. Source: Electrochimica Acta ; Volume 48, Issue 28 , 2003 , Pages 4143-4148 ; 00134686 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0013468603005826