Glutathione modified screen-printed carbon nanofiber electrode for the voltammetric determination of metal ions in natural samples

Talanta. 2016 Aug 1:155:8-13. doi: 10.1016/j.talanta.2016.04.011. Epub 2016 Apr 7.

Abstract

This work reports the development of a glutathione modified electrode via electrografting on a screen-printed carbon nanofiber substrate (GSH-SPCNFE). GSH-SPCNFE was compared to a classical screen-printed carbon electrode modified with glutathione (GSH-SPCE) for the simultaneous voltammetric determination of Cd(II) and Pb(II). Their electrochemical characterization and analytical performance suggest that SPCNFE could be a much better support for GSH immobilization. The applicability of GSH-SPCNFE for the determination of low concentration levels of Pb(II) and Cd(II) ions in environmental samples was successfully tested in a certified wastewater reference material by means of stripping voltammetry with a very high reproducibility and good trueness.

Keywords: Electrochemical grafting; Glutathione; Metal determination; Peptide-modified sensors; Screen-printed electrodes; Stripping voltammetry.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cadmium / analysis*
  • Cadmium / chemistry
  • Calibration
  • Carbon / chemistry*
  • Electrochemistry
  • Electrodes
  • Glutathione / chemistry*
  • Lead / analysis*
  • Lead / chemistry
  • Nanofibers / chemistry*
  • Printing*
  • Time Factors
  • Wastewater / chemistry*

Substances

  • Waste Water
  • Cadmium
  • Lead
  • Carbon
  • Glutathione