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High-speed microemulsion electrokinetic chromatography.

P E Mahuzier1, B J Clark, S M Bryant

  • 1GlaxoSmithKline Research and Development, Ware, Herts, UK. pem81888@gsk.com

Electrophoresis
|November 9, 2001
PubMed
Summary
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Microemulsion electrokinetic chromatography (MEEKC) analysis times were reduced to under 1 minute. This was achieved by optimizing microemulsion composition and employing high voltage and temperature for faster separations.

Area of Science:

  • Analytical Chemistry
  • Separation Science

Background:

  • Traditional microemulsion electrokinetic chromatography (MEEKC) often requires long analysis times (around 10 minutes) due to high-ionic strength buffers.
  • High buffer ionic strength leads to high currents, limiting applicable voltages and thus extending separation times.
  • High surfactant concentrations are typically needed for microemulsion formation, contributing to the high ionic strength.

Purpose of the Study:

  • To significantly reduce MEEKC analysis times.
  • To explore methods for achieving rapid separations in MEEKC.
  • To investigate the impact of microemulsion composition and operational parameters on migration times.

Main Methods:

  • Optimizing microemulsion composition by selecting oils with lower surface tension to reduce surfactant concentration.

Related Experiment Videos

  • Employing high voltage and high temperature.
  • Utilizing short capillaries with injection at the "short end".
  • Simultaneously applying pressure and voltage.

    • Main Results:

    • Achieved MEEKC migration times below 1 minute.
    • Demonstrated the feasibility of long injection sequences.
    • Confirmed minimal buffer depletion effects even with rapid separations.
    • Showcased the potential for faster and more efficient MEEKC analyses.

    Conclusions:

    • MEEKC analysis times can be drastically reduced to under 1 minute through optimized conditions.
    • The developed methods allow for rapid separations without compromising injection capacity or buffer stability.
    • This advancement offers a more efficient approach to MEEKC separations.