A new easy-to-prepare homogeneous continuous electrochromatographic bed for enantiomer recognition

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.