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 journalArticlepeer-review

    57 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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