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Strategies in method development to quantify enantiomeric impurities using CE.

Sami El Deeb¹, Phillip Hasemann, Hermann Wätzig

¹Department of Pharmaceutical Chemistry, Al-Azhar University-Gaza, Gaza, Palestinian Territory.

Electrophoresis

|September 23, 2008

Summary

Developing enantioselective methods is crucial for chiral drugs. This study optimized capillary electrophoresis using cyclodextrins for chiral drug separation and impurity quantification.

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Area of Science:

Analytical Chemistry
Pharmaceutical Analysis
Chiral Separations

Background:

The increasing number of chiral drug substances necessitates robust enantioselective separation methods.
International Conference on Harmonization guidelines mandate precise quantification of enantiomeric impurities (0.1%).
Capillary electrophoresis (CE) is a vital technique for separating chiral compounds.

Purpose of the Study:

To develop and optimize a comprehensive strategy for enantioselective separation and impurity quantification of chiral drugs using CE.
To screen and select appropriate chiral selectors (cyclodextrins) for effective chiral drug separation.
To optimize CE conditions for resolution and reduced analysis time, meeting regulatory requirements.

Main Methods:

Screening of 22 neutral, anionic, and cationic cyclodextrins in phosphate buffer (pH 2.5, 50 mM, 2.0% CD) for the separation of 14 chiral compounds.
Optimization of key parameters: chiral selector concentration (1-10%), buffer pH (2.0-9.0), and organic modifier percentage (0-15%).
Determination of necessary resolution (3-4) for racemic mixtures to enable peak overloading and enhance signal-to-noise ratio.

Main Results:

A systematic strategy was established for chiral drug separation and impurity quantification via CE.
The study identified optimal conditions for separating various chiral compounds using different cyclodextrins.
A resolution of 3-4 was confirmed as critical for accurate enantiomeric impurity quantification.

Conclusions:

The developed CE strategy effectively addresses the need for enantioselective separation of chiral drugs.
Optimized conditions using cyclodextrins facilitate accurate quantification of enantiomeric impurities, meeting regulatory standards.
This approach provides a reliable method for pharmaceutical analysis of chiral substances.