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Journal of Materials Science

, Volume 44, Issue 10, pp 2688–2693 | Cite as

Immobilization of 1,2-naphthoquinone-4-sulfonic acid on gold electrode: application for cysteamine detection using Michael addition

  • Jahan-Bakhsh RaoofEmail author
  • Reza Ojani
  • Fereshteh Chekin
Article

Abstract

Fabrication and electrochemical characterization of adsorbed 1,2-naphthoquinone-4-sulfonic acid sodium (Nq)-modified gold electrode is described in a wide pH range (3.00–9.00) in 0.1 M phosphate buffer solution using cyclic voltammetry (CV), differential pulse voltammetry (DPV), and double-step potential chronoamperometry methods. The resulting Nq thin film-modified gold electrode (Nq/Au) was tested successfully to recognize cysteamine in an aqueous solution. It is found that cysteamine participates in Michael addition reaction with adsorbed Nq on gold electrode to form the corresponding thioquinone derivative. The reoxidation of the adduct at a potential of about 650 mV less positive than cysteamine at the surface of the bare Au electrode leads to an increase in the oxidative current, which is proportional to the concentration of cysteamine. The calibration plot for cysteamine was found to be linear in the ranges of 6.0 × 10−5–4.5 × 10−3 M and 8.0 × 10−6–5.5 × 10−4 by CV and DPV, respectively.

Keywords

Cyclic Voltammetry Phosphate Buffer Solution Gold Electrode Differential Pulse Voltammetry Cysteamine 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Jahan-Bakhsh Raoof
    • 1
    • 2
    Email author
  • Reza Ojani
    • 1
  • Fereshteh Chekin
    • 1
    • 2
  1. 1.Department of Analytical Chemistry, Faculty of Chemistry, Electroanalytical Chemistry Research LaboratoryMazandaran UniversityBabolsarIran
  2. 2.Department of ChemistryIslamic Azad University, Ayatollah Amoli BranchAmolIran

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