Dopamine Detection Using the Selective and Spontaneous Formation of Electrocatalytic Poly(dopamine) Films on Indium-Tin Oxide Electrodes

Byung Kwon Kim, Seonhye Son, Kwangyeol Lee, Haesik Yang, Juhyoun Kwak

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

In this study, we report the simple and sensitive electrochemical detection of dopamine in the presence of excess ascorbic acid. The detection is based on the spontaneous formation of electrocatalytic poly(dopamine) films on bare indium-tin oxide (ITO) electrodes. The poly(dopamine) films are formed by immersing ITO electrodes in a solution of dopamine and ascorbic acid for 10min. Afterwards, the electrocatalytic oxidation of hydrazine is measured using modified electrodes. The electrooxidation current of hydrazine increases with increasing dopamine concentration. This method allows a detection limit of 1nM for dopamine in the presence of 100μM of ascorbic acid.

Original languageEnglish
Pages (from-to)993-996
Number of pages4
JournalElectroanalysis
Volume24
Issue number5
DOIs
Publication statusPublished - 2012 May

Keywords

  • Ascorbic acid
  • Dopamine
  • Hydrazine
  • Indium-tin oxide
  • Poly(dopamine)

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry

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