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Effect of mobile phase additive on chiral separation

机译:流动相添加剂对手性分离的影响

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Cellulose tris(3,5-dimethylphenylcarbamate) (OD) and amylose tris(3,5-dimethylphenylcarbamate) (AD) exhibit high chiral recognition and have been extensively used to resolve a broad range of racemates, which appear to be the most practically useful chiral stationary phases (CSPs). Cyclodextrin CSPs demonstrate unusual selectivity under either reversed- or normal-phase modes mainly attributable to inclusion complex properties and hydrogen bonding interaction, respectively. In this study the influence of the presence of heptakis(2,3,6-tri-O-methyl)-β-cyclodextrin (TM-β-CD) in mobile phase on the enantioseparations is described. Three chiral stationary phases including cellulose tris(3,5-dimethylphenylcarbamate), amylose tris(3,5-dimethylphenylcarbamate) and their mixture are employed, with hexane/isopropanol (90:10) as mobile phase. The separation behaviour of 10 racemates when TM-β-CD are added as mobile phase additive provided information concerning the interaction of the enantiomer with the TM-β-CD, OD and AD. The increase in the selectivity of separation for some racemates is a favourable consequence of the presence of the TM-β-CD mobile phase additive.
机译:纤维素三(3,5-二甲基苯基氨基甲酸酯)(OD)和直链淀粉三(3,5-二甲基苯基氨基甲酸酯)(AD)表现出高度的手性识别能力,并已广泛用于解决广泛的外消旋体,这似乎是最实用的手性固定相(CSP)。环糊精CSPs在反相或正相模式下均表现出不同寻常的选择性,这分别归因于夹杂物的复杂性质和氢键相互作用。在这项研究中,描述了流动相中七(2,3,6-三-O-甲基)-β-环糊精(TM-β-CD)的存在对对映体分离的影响。使用三个手性固定相,包括纤维素三(3,5-二甲基苯基氨基甲酸酯),直链淀粉三(3,5-二甲基苯基氨基甲酸酯)及其混合物,己烷/异丙醇(90:10)作为流动相。当添加TM-β-CD作为流动相添加剂时10种外消旋物的分离行为提供了有关对映体与TM-β-CD,OD和AD相互作用的信息。对于某些外消旋物,分离选择性的增加是存在TM-β-CD流动相添加剂的有利结果。

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