Poly(Methyl Red) Modified Glassy Carbon Electrodes: Electrosynthesis, Characterization, and Sensor Behavior


KUL D., Ozturk G.

ELECTROANALYSIS, vol.29, no.7, pp.1721-1730, 2017 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 29 Issue: 7
  • Publication Date: 2017
  • Doi Number: 10.1002/elan.201700043
  • Journal Name: ELECTROANALYSIS
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.1721-1730
  • Keywords: Methyl red, Electropolymerization, Cyclic voltammetry, Differential pulse voltammetry, Uric acid, FILM-MODIFIED ELECTRODE, URIC-ACID, ASCORBIC-ACID, ELECTROCHEMICAL DETERMINATION, CAPILLARY-ELECTROPHORESIS, SENSITIVE DETERMINATION, SELECTIVE DETERMINATION, PASTE ELECTRODE, DOPAMINE, OXIDATION

Abstract

Poly(methyl red), PMR, was electropolymerized on glassy carbon electrodes by potential cycling in 50mM phosphate buffer solution at pH7.0 and 8.0 and Britton Robinson buffer solution in the pH range 7.0-11.0. The electrochemical behavior of PMR modified electrodes was investigated by cyclic voltammetry in Britton Robinson buffer solution at different pHs from 5.0 to 10.0 and found that the best PMR film formation was obtained at pH9.0. Uric acid was quantitatively determined at PMR modified electrodes by cyclic voltammetry and differential pulse voltammetry in Britton Robinson buffer at pH5.0. Both methods presented a linear dependence between the anodic peak current and the concentration of uric acid in the range of 0.4 to 60 M and 0.08 to 100 M with the limits of detection of 0.038 and 0.009 M for cyclic voltammetry and differential pulse voltammetry, respectively. Poly(methyl red) as redox mediator allowed the determination of uric acid without any interferences from the substances in serum samples.