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A new easy-to-prepare homogeneous continuous electrochromatographic bed for enantiomer recognition
A Végvári1, A Földesi, C Hetényi
1Central Research Laboratory, Medical Faculty, University of Pécs, Hungary.
Electrophoresis
|September 23, 2000
Summary
Homogeneous polyacrylamide gels enable robust capillary electrochromatography (CEC) for separating drug enantiomers. These stable, customizable gels offer broad applications in chiral separations, independent of flow rate.
Area of Science:
- Analytical Chemistry
- Separation Science
- Chromatography
Background:
- Capillary electrochromatography (CEC) is a powerful separation technique.
- Development of stable and versatile stationary phases is crucial for CEC.
- Chiral separations of drug enantiomers require specialized chromatographic materials.
Purpose of the Study:
- To develop and evaluate novel polyacrylamide-based homogeneous gels for CEC.
- To investigate the application of these gels in the chiral separation of drug enantiomers.
- To understand the separation mechanism and performance characteristics of the developed gels.
Main Methods:
- Preparation of covalently linked, homogeneous polyacrylamide gels within capillaries.
- Copolymerization of polyacrylamide with allyl-beta-cyclodextrin (allyl-beta-CD) for chiral recognition.
- Chiral separation of eight acidic, neutral, and basic drug compounds using CEC.
Main Results:
- Successful enantiomeric separation of multiple drug compounds, often achieving baseline resolution.
- Resolution was found to be independent of electroendosmotic velocity (EOF), allowing rapid analysis.
- Analysis of plate height indicated that the van Deemter equation's last term was dominant, suggesting adsorption-based separation mechanisms.
Conclusions:
- Homogeneous polyacrylamide gels offer a stable, long-lasting, and customizable stationary phase for CEC.
- The developed allyl-beta-CD modified gels are effective for chiral separations of diverse drug compounds.
- The open gel structure facilitates satisfactory EOF, and separation appears to be governed by adsorption rather than molecular sieving.