Enantiomers resolution in capillary zone electrophoresis by using cyclodextrins

Area of Science:

• Analytical Chemistry
• Chiral Separations
• Pharmaceutical Analysis

Background:

• Chiral compounds exist as enantiomers, often with different biological activities.
• Separating enantiomers is critical in pharmaceutical development and quality control.
• Cyclodextrins are widely used as chiral selectors in separation science.

Purpose of the Study:

• To investigate the effectiveness of cyclodextrins in resolving racemic mixtures.
• To identify key parameters influencing enantiomeric resolution.
• To evaluate specific cyclodextrins for separating pharmaceutical-related compounds.

Main Methods:

• Capillary electrophoresis (CE) was employed for enantiomeric separation.
• Various cyclodextrin types and concentrations were tested as background electrolyte additives.
• Column temperature was systematically varied to assess its impact on resolution.
• Specific analytes including nor-epinephrine, epinephrine, isoproterenol, octopamine, and ketamine were analyzed.

Main Results:

• Cyclodextrins demonstrated utility in resolving enantiomers.
• Increased column temperature negatively affected the resolution of nor-epinephrine, epinephrine, and isoproterenol.
• 2,6-di-O-methyl-beta-cyclodextrin enabled the resolution of octopamine and ketamine.
• Despite a stronger inclusion complex, ketamine resolution was suboptimal.

Conclusions:

• Cyclodextrin-mediated chiral resolution is feasible but sensitive to experimental conditions.
• Temperature control is a critical factor for successful enantiomeric separation.
• Modified cyclodextrins show promise but require optimization for specific analytes like ketamine.