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Voltammetric detection for capillary electrophoresis

S Park1, M J McGrath, M R Smyth

  • 1Department of Chemistry, University of Kansas, Lawrence 66045, USA.

Analytical Chemistry
|August 1, 1997
PubMed
Summary

A new voltammetric detector for capillary electrophoresis (CE) minimizes ohmic drop using a Nafion cell. This improves analyte detection and reduces background current for sensitive analysis.

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Area of Science:

  • Analytical Chemistry
  • Electrochemistry
  • Separation Science

Background:

  • Amperometric detection is commonly used for capillary electrophoresis (CE).
  • Minimizing ohmic potential drop and background current are challenges in CE detection.
  • Existing methods often suffer from peak band broadening and limited sensitivity.

Purpose of the Study:

  • To develop a novel voltammetric detector for CE.
  • To minimize ohmic potential drop and peak band broadening.
  • To improve the detection of analytes against a large background current.

Main Methods:

  • A cast Nafion detection cell was integrated at the capillary end.
  • A dynamic background subtraction scheme with a compensating electrode was implemented.

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  • Post-experimental digital background subtraction was also utilized.

    • Main Results:

    • The Nafion cell provided a low-dead-volume, low-resistance interface, reducing ohmic drop and band broadening.
    • Dynamic and digital background subtraction effectively eliminated background current while preserving the analytical signal.
    • The system achieved high-quality voltammetric responses for analytes at concentrations as low as 0.20 microM.
    • The detector successfully analyzed a mixture of eight phenolic acids using CE voltammograms.

    Conclusions:

    • The developed voltammetric detector offers a significant advancement for CE analysis.
    • The combination of a Nafion cell and advanced background subtraction enhances sensitivity and reduces interference.
    • This method provides a robust platform for sensitive electrochemical detection in CE applications.