Chiral Selector-Enhanced Chromatographic Separation of Chlorthalidone Enantiomers

Abstract

Enantiomeric separation of (RS)-chlorthalidone has been achieved by thin-layer chromatography (TLC) using cyclodextrin, containing hydroxylic group as the chiral selector. For enantioseparation, cyclodextrin was used as a chiral additive in the stationary phase in a non-covalent mode and there was no chiral additive in the mobile phase; the native enantiomers were isolated and characterized. Cyclodextrin was also added to mobile phase and there was no chiral selector in the stationary phase.  The spots were then isolated and characterized. The effect of the composition of the mobile phase, pH, and temperature was studied for the optimization of successful separation conditions. The spots were located in an iodine chamber.