Electrochemical Construction of a Polymer-Metal Complex Surface Network for Selective Determination of Dopamine in Blood Serum

Mohammad Al-Hinaai, Emad A. Khudaish*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A surface base polymeric film was fabricated onto a glassy carbon electrode (GCE) via reversible voltammetric scanning in acidic electrolyte containing a (2,4,6-triaminopyrmidine) monomer (TP). The assembled poly(2,4,6-triaminopyrmidine) (PTP) surface material was further modified by electrochemical attachment of tris(2,2'-bipyridine) ruthenium(II) described as Ru(II)-complex. The structure and electrochemical properties of the resulting (Ru-PTP-GCE) surface network were characterized using X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The apparent estimated value of electron transfer rate constant (k app) of the prepared sensor was three times greater than the virgin PTP. The cooperative effects of the (PTP) and Ru(II)-complex composite increased the efficiency and the stability of the proposed sensor for the selective determination of dopamine (DA) in the presence of ascorbic acid (AA) and uric acid (UA). The detection limit (DL3σ) of DA in this environment was 0.021μM. The fabricated sensor was successfully applied for DA detection in a blood serum sample with satisfactory recovery.

Original languageEnglish
Pages (from-to)1249-1268
Number of pages20
JournalAnalytical Letters
Issue number8
Publication statusPublished - 2022
Externally publishedYes


  • ascorbic acid
  • dopamine
  • poly(2,4,6-triaminopyrimidine)
  • ruthenium(II) complex

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Spectroscopy
  • Clinical Biochemistry
  • Biochemistry, medical
  • Electrochemistry

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