title: Enantioseparation of lomefloxacin hydrochloride by high-speed counter-current chromatography using sulfated-β-cyclodextrin as a chiral selector.
abstract: Enantiomers of lomefloxacin hydrochloride were separated by high-speed counter-current chromatography (HSCCC) using sulfated-β-cyclodextrin as a chiral selector (CS). The separation was performed with a two-phase solvent system composed of ethyl acetate-methanol-water (10:1:10, v/v) containing CS at 0-60mmol/l in a head-to-tail elution mode, while obtained fractions were identified by polarimeter and spectropolarimeter. The results show that the concentration of the CS in the system strongly affects the peak resolution (Rs). As the concentration of CS increases, the Rs first increases reaching the maximum at 50mmol/l and then decreases. When the CS concentration is kept constant in the solvent systems, the Rs decreases as the concentration of the lomefloxacin hydrochloride increases. The overall results of our studies indicated that sulfated-β-cyclodextrin is very useful for the chiral separation by HSCCC.
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, 15 Beisanhuan East Road, Chaoyang District, Beijing 100029, PR China. weiyun@mail.buct.edu.cn
authors.forename: Yun
authors.initials: Y
authors.lastname: Wei
authors.forename: Shijuan
authors.initials: S
authors.lastname: Du
authors.forename: Yoichiro
authors.initials: Y
authors.lastname: Ito
mesh_terms: D002851:Chromatography, High Pressure Liquid; D002942:Circular Dichroism; D003377:Countercurrent Distribution / Q000379:methods*; D024841:Fluoroquinolones / Q000737:chemistry* / Q000302:isolation & purification; D013237:Stereoisomerism; D013431:Sulfates / Q000737:chemistry; D047392:beta-Cyclodextrins / Q000737:chemistry*
chemical_list: D024841:Fluoroquinolones; D013431:Sulfates; D047392:beta-Cyclodextrins; C053091:lomefloxacin