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On-column refractive index detector for flash chromatography
1Department of Chemistry and Biochemistry, University of Colorado, Boulder 80309, USA.
Journal of Chromatography. A
|August 19, 2000
Summary
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.
- 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.