高效液相色谱手性流动相添加剂分离肾上腺素类对映体

 将β－环糊精、２，６－二甲基－β－环糊精、２，３，６－三甲基－β－环糊精分别作为手性流动相添加剂，较系统地研究了Ｄ，Ｌ－肾上腺素、Ｄ，Ｌ－异丙肾上腺素、Ｄ，Ｌ－麻黄碱在反相ＨＰＬＣ系统中的拆分，建立了甲基化β－环糊精动态手性固定相法分离肾上腺素类药物对映体的方法，探讨了立体选择性与环糊精主体和客体分子结构之间的关系

Enantiomeric High Performance Liquid Chromatographic Separation of Epinephrine and Analogous Using Chiral Mobile Phase Additives

The enantiomeric resolution of epinephrine, isoproterenol, ephedrine was studied by reversed phase HPLC. beta-CD, DM-beta-CD, TM-beta-CD were used as chiral mobile phase additives. The effects of the concentration of DM-beta-CD and the concentration of methanol on resolution of D,L-epinephrine were investigated. The results showed: D,L-epinephrine and D,L-isoproterenol can be separated by beta-CD, DM-beta-CD, TM-beta-CD, but D,L-ephedrine can't. Hydrogen bonding plays an important role in the chiral recognition mechanism. In the separation of isoproterenol, the enantioselectivity of TM-beta-CD was better than those of beta-CD and DM-beta-CD. As the concentration of DM-beta-CD changed from 0.04 mmol/L to 1.00 mmol/L, the resolution varied slightly. The experiment of the effect of methanol concentration on Rs showed: when the ratio of methanol/water was 40/60, the Rs reached the maximum. The coefficients of variation of retention time of D-epinephrine and L-epinephrine were 1.3% and 1.4% respectively. It is demonstrated that the chromatographic systems with a dynamically-generated stationary phase with methylated-beta-cyclodextrin are versatile tools for enantiomer separation. This technique leads to column with excellent time stability and good reproducibility of the enantio-selectivity.