摘要:
目的:建立超临界流体色谱法手性分离1,4-二氢吡啶类钙拮抗剂(1,4-DHPs),并基于超分子作用机制对其手性识别机理进行初步探讨.方法:采用超临界流体色谱法,以超临界二氧化碳作为流动相,流动相流速2 mL· min-1,检测波长237 nm,研究5种1,4-DHPs(尼索地平、西尼地平、普拉地平、阿折地平、盐酸马尼地平)在Sino-Chiral OJ手性色谱柱上的对映体分离,并考察不同改性剂种类(甲醇、乙醇、异丙醇)、比例以及系统背压(13~17 MPa)对分离效果的影响.结果:5种1,4-DHPs在柱温为35°C,系统背压为15 MPa时,在30 min内均实现了基线分离(分离度>1.5),尼索地平、西尼地平、普拉地平、阿折地平、盐酸马尼地平优化改性剂依次为二氧化碳-异丙醇(92∶8)、二氧化碳-甲醇(84∶ 16)、二氧化碳-乙醇(74∶26)、二氧化碳-乙醇(74∶26)、二氧化碳-乙醇(74∶26).研究发现,随着改性剂比例的增大,容量因子逐渐减小;甲醇和乙醇对1,4-DHPs的洗脱能力始终大于异丙醇;系统背压越大,出峰速度越快.结论:1,4-DHPs对映体在超临界流体色谱上可得到高效、快速的分离,其识别机理对同类化合物的拆分具有一定指导意义.%Objective:To establish the methods for enantioseparation of five 1,4-dihydropyridinescalcium antagonist (1,4-DHPs) by supercritical fluid chromatography (SFC) on chiral stationary phase,and to explore the seperationmechanism based on supermolecular chemistry.Methods:Five 1,4-DHPs (nisoldipine,cilnidipine,pranidipine,azelnidipine,manidipine hydrochloride) were separated by supercritical fluid chromatography (SFC) with supercritical carbon dioxide on a Sino-Chiral OJ column atthe flow rate of 2 mL· min-1 at the temperature of 35 °C and the UV detection was set on 237 nm.The effect of different type and percentage of modifiers (methanol,ethanol,isopropanol) and back pressure (13-17 MPa) on the separation was also investigated.Results:All the 1,4-DHPs were obtained from the optimal separation (resolution >1.5)with the back pressure of 15 MPa and ratioof carbon dioxidide-isopropanol (92:8),carbon dioxidide-methanol (84:16),carbon dioxidide-ethanol (74:26),carbon dioxidide-ethanol (74:26),carbon dioxidide-ethanol (74:26),respectively.The study found the decrease of capacity factor was with the increase of modifiers' percentage,and the higher the back pressure of the system,the faster the peak of the 1,4-DHPs eluted.The elution capacity of both methanol and ethanol was more effective than that of isopropanol.Conclusion:DHPs can be separated by SFC effectively and quickly,and the separation mechanism can be used as guidance for the same kind of compounds.