Electrocatalytic detection of phenolic estrogenic compounds at NiTPPS|carbon nanotube composite electrodes

Xiaoqiang Liu, Heqing Feng, Xiuhua Liu, Danny K Y Wong*

*Corresponding author for this work

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

A Ni(II)tetrakis(4-sulfonatophenyl) porphyrin (NiTPPS)|carbon nanotube composite electrode that shows strong catalytic and antifouling capability was developed to detect a series of phenolic endocrine compounds including bisphenol A, nonylphenol and ethynylestradiol. This electrode was fabricated by electropolymerizing NiTPPS complexes on a carbon nanotube-modified glassy carbon electrode. Optimized experimental parameters including a hydrodynamic potential of 0.7V for flow injection analysis (FIA) and a NiTPPS surface coverage of 2.2nmolcm-2 (standard deviation 0.2nmolcm-2; n=6) were obtained for detection of the endocrine disrupting compounds. The sensor responded well to all the tested compounds with limits of detection ranging from 15nmolL-1 to 260nmolL-1 (based on three times S/N ratio) under FIA conditions. Both carbon nanotubes and NiTPPS account for the excellent performance of the composite modified electrode.

Original languageEnglish
Pages (from-to)212-218
Number of pages7
JournalAnalytica Chimica Acta
Volume689
Issue number2
DOIs
Publication statusPublished - 18 Mar 2011

Keywords

  • Carbon nanotubes
  • Electrochemical detection
  • Electrochemical impedance spectroscopy
  • Endocrine disrupting compounds
  • Flow injection analysis
  • Ni(II)tetrakis(4-sulfonatophenyl) porphyrin

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