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Related Experiment Videos

Low-energy interactions in high-performance liquid chromatography.

Y V Kazakevich1, H M McNair

  • 1Seton Hall University, S. Orange, NJ 07079, USA.

Journal of Chromatography. A
|April 5, 2000
PubMed
Summary

Researchers studied liquid chromatography systems using n-alkanes. They found analyte retention volume decreases with more analyte carbon atoms but increases with more eluent carbon atoms, explained by adsorption theory.

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Area of Science:

  • Analytical Chemistry
  • Chromatography

Background:

  • Understanding analyte-adsorbent interactions is crucial in liquid chromatography.
  • Reversed-phase chromatography with C18 stationary phases is widely used.

Purpose of the Study:

  • To investigate liquid chromatographic systems with minimal analyte-adsorbent interactions.
  • To elucidate the retention behavior of n-alkanes in homologous series.

Main Methods:

  • Utilized homologous series of n-alkanes as analytes and mobile phases.
  • Employed a C18 reversed-phase adsorbent.
  • Analyzed retention volumes and temperature dependencies.

Main Results:

  • Observed a linear decrease in analyte retention volume with increasing analyte carbon number.

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  • Found a corresponding increase in analyte retention with increasing eluent carbon number.
  • Demonstrated good correlation between interpolated and measured column hold-up volumes.

    • Conclusions:

    • Proposed an explanation for observed retention effects based on adsorption theory.
    • Indicated that retention in these alkane systems is primarily entropy-governed.
    • Validated interpolation methods for determining column hold-up volume.