Electrochemical sensors for dopamine using graphene-cobalt(II) complex modified glassy carbon electrode by adsorptive voltammetry

Carol Cuadrado, Laura Ibarra, John Hurtado, Olimpo García-Beltrán, Edgar Nagles

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

[Co(bdmpzm)2(NCS)2] (bdmpzm=bis(3,5-dimethylpyrazol-1-yl)methane) was dispersed in graphene oxide (GOx). Composite GOx-[Co(bdmpzm)2(NCS)2] was deposited on a glassy carbon electrode (GCE) and reduced at -1.0 by 60 s. The modified electrode rGOx-[Co(bdmpzm)2(NCS)2]/GCE allowed the oxidation for dopamine (DA) at 0.41 V Our results showed reversible and sensitive process, (ΔV 0.09 V) compared with the electrode without modified in buffer phosphate solution pH 3.0. The detection limit (3σ/b) for dopamine was 0.11 μmol L-1 and the RSD was 3.0%. The presence of uric acid and ascorbic acid did not interfere with the signal for dopamine.

Original languageEnglish
Pages (from-to)910-921
Number of pages12
JournalAnalytical and Bioanalytical Electrochemistry
Volume8
Issue number7
StatePublished - 15 Nov 2016

Bibliographical note

Funding Information:
E. N and O. G thank to the financial support by the Universidad de Ibagu? (15-376-INT- 16-416-INT) is gratefully acknowledged. J.H thank the Department of Chemistry and the School of Science of the Universidad de los Andes for the financial support.

Keywords

  • Adsorptive voltammetry
  • Cobalt(II) complex
  • Dopamine
  • Graphene oxide
  • Human urine
  • Uric acid

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