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On-column refractive index detector for flash chromatography.

S G Westerbuhr1, K L Rowlen

  • 1Department of Chemistry and Biochemistry, University of Colorado, Boulder 80309, USA.

Journal of Chromatography. A
|August 19, 2000
PubMed
Summary
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A new detector for flash chromatography uses refractive index changes to identify compounds exiting the column. This simple, inexpensive device reduces analysis time and allows for in-process monitoring of separations.

Area of Science:

  • Analytical Chemistry
  • Chromatography

Background:

  • Flash chromatography is a common purification technique.
  • On-column detection can improve efficiency and reduce analysis time.

Purpose of the Study:

  • To report a universal detector for on-column analysis in flash chromatography.
  • To provide a simple and inexpensive method for monitoring analyte exit times.

Main Methods:

  • The detector utilizes changes in refractive index as analytes pass through an illuminated region.
  • The column packing material acts as a diffuse scattering medium.
  • An empirical model was developed to explain the observed detection trends.

Main Results:

  • The detector provides a signal based on the refractive index mismatch between the solvent and packing material.

Related Experiment Videos

  • The magnitude of the signal correlates with the degree of refractive index change.
  • The detector allows for determination of species exit times directly from the column.

    • Conclusions:

    • This universal detector offers a cost-effective solution for real-time monitoring in flash chromatography.
    • It significantly reduces the need for post-column analysis.
    • The movable nature of the detector enables monitoring of separations as they happen.