Three liquid-chromatography columns, containing immobilized proteins as chiral stationary phases (CSPs) were investigated for the direct separation of enantiomers of racemic indenoindolic compounds. By using an experimental design the effects of column temperature, pH, ionic strength, and type and concentration of organic solvent in the mobile phase on retention and resolution of racemic substances were systematically studied. The three CSPs investigated consisted of alpha(1)-acid glycoprotein (Chiral-AGP), bovine serum albumin (BSA-DSC) and ovomucoid (Ultron ES-OVM). The two enantiomers of all studied compounds could be separated on at least one of the three CSPs, which have different enantioselective properties.
Chromatography, Liquid Hydrogen-Ion Concentration