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Application and comparison of high performance liquid chromatography and high speed counter-current chromatography in enantioseparation of (±)-2-phenylpropionic acid

Tong, Shengqiang, Zheng, Ye, Yan, Jizhong
Journal of chromatography 2013 v.1281 pp. 79-86
acetic acid, countercurrent chromatography, enantiomers, high performance liquid chromatography, methanol, pH, solvents, temperature, triethylamine
High performance liquid chromatography (HPLC) and high speed counter-current chromatography (HSCCC) were applied and compared in enantioseparation of 2-phenylpropionic acid (2-PPA) when hydroxypropyl-β-cyclodextrin (HP-β-CD) was used as chiral mobile phase additive. For HPLC, the enantioseparation was achieved on ODS C₁₈ reverse phase column and the mobile phase was 25mmolL⁻¹ HP-β-CD aqueous buffer solution (pH4.0, adjusted with triethylamine): methanol: glacial acetic acid (85:15:0.5 (v/v/v)). For HSCCC, the two-phase solvent system was composed of n-hexane-ethyl acetate-0.1molL⁻¹ phosphate buffer solution pH2.67 (5:5:10 for isocratic elution and 8:2:10 for recycling elution (v/v/v)) added with 0.1molL⁻¹ HP-β-CD. The key parameters, such as a substitution degree of HP-β-CD, the concentration of HP-β-CD, pH value of the aqueous phase and the temperature were optimized for both separation methods. Using the optimum conditions a complete HSCCC enantioseparation of 40mg of 2-propylpropionic acid in a recycling elution mode gave 15–18mg of (+)-2-PPA and (-)-2-PPA enantiomers with 95–98% purity and 85–93% recovery.