Table 3.

Determination of Enantiomeric Purity of Selected Compounds by CE Using CDs as Chiral Selectors

compd	CDa added to inlet bufferb	CDa added to outlet bufferb	capillary effective length (cm)	determined purity ± RSDc(%)	determined impurityd ± RSD (%)
R-19	β-CD (6 mM)	s-β-CD (10 mg/mL)	40	99.23 ± 0.03 (n = 3)	0.77 ± 0.03
R-24e	β-CD (6 mM)	s-β-CD (1.5 mg/mL)	40	99.68 ± 0.01 (n = 2)	0.32 + 0.01
R-24e	HPCD (6 mM) + s-β-CD (1.5 mg/mL)	s-β-CD (1.5 mg/mL)	50	99.71 ± 0.04 (n = 5)	0.29 ± 0.04
S-24	β-CD (6 mM)	s-β-CD (1.5 mg/mL)	40	97.69 ± 0.04 (n = 3)	2.31 ± 0.04

^aβ-CD, β-cyclodextrin; s-β-CD, sulfated β-cyclodextrin; HPCD, 2-hydroxypropyl-cyclodextrin.

^bPhosphate buffer, 50 mM, pH 4.5.

^cRSD = relative standard deviation.

^dBy the other enantiomer.

^eTwo different batches.