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Related Experiment Videos

High speed gradient elution reversed-phase liquid chromatography.

Adam P Schellinger1, Dwight R Stoll, Peter W Carr

  • 1Department of Chemistry, Smith and Kolthoff Halls, University of Minnesota, 207 Pleasant St. S.E., Minneapolis, MN 55455, USA.

Journal of Chromatography. A
|March 3, 2005
PubMed
Summary
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Achieving excellent column re-equilibration for chromatography is faster than full equilibration. This study identifies factors affecting full equilibration speed and proposes solutions to instrumental limitations.

Area of Science:

  • Analytical Chemistry
  • Chromatography

Background:

  • Gradient elution in chromatography requires column re-equilibration, impacting analysis speed.
  • Two states of re-equilibration exist: run-to-run repeatability and full equilibration.

Purpose of the Study:

  • To differentiate between run-to-run repeatability and full equilibration.
  • To investigate methods for accelerating full column equilibration.
  • To identify instrumental limitations in reducing equilibration time.

Main Methods:

  • Investigated re-equilibration using varying column volumes.
  • Assessed the impact of ancillary solvents, particle pore size, eluent composition, column temperature, and flow rate.
  • Analyzed thermodynamic versus kinetic control of equilibration.

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  • Evaluated instrumental design factors affecting equilibration time.

    • Main Results:

    • Excellent run-to-run repeatability achieved within 2 column volumes.
    • Full equilibration can necessitate over 20 column volumes.
    • Full equilibration appears thermodynamically limited.
    • Instrument design is a key limitation for reducing full equilibration time.

    Conclusions:

    • Distinguishing between repeatability and full equilibration is crucial for optimizing chromatographic methods.
    • Several factors influence full equilibration speed, but thermodynamic limitations persist.
    • Novel approaches are needed to overcome instrumental constraints and reduce analysis times.