Abstract
This work describes the use of β-cyclodextrin (β-CD) as a mobile phase additive in combination with ion interaction reagents (IIR) for the enantioresolution of cyclopentolate, 2,6-diketopiperazine derivative and methylphenobarbital. The effect of concentration and type of IIR and temperature on retention and enantioseparation were studied. It has been found that the addition of an IIR to β-CD solution can lead to the improvement in enantioresolution. Interestingly, the most significant enhancement of enantioresolution was achieved for cyclopentolate, most probably due to its highest basicity. Also the stability constants of the complexes formed between β-CD and model compounds in the presence of IIR were estimated. Significant increase of complexation rate of cyclopentolate with β-cyclodextrin in presence of IIRs was observed.
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