• enantioseparation of mandelic acid enantiomers in ionic liquid aqueous two-phase extraction systems

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     in the past decade, ionic liquids have received great attention owing to their potential as green solvent alternatives to conventional organic solvents. in this work, hydrophobic achiral ionic liquids (1-butyl-3-methylimidazolium-hexafluorophosphate([bmim][pf6]), 1-octyl-3-methylimidazolium tetrafluoroborate([omim][bf4])) were used as solvents in chiral liquid-liquid extraction separation of mandelic acid (ma) enantiomers with β-cyclodextrin (β-cd) derivatives as hydrophilic chiral selectors preferentially forming complexes with (r)-enantiomers. factors affecting the separation efficiency were optimised, namely the type of the extraction solvents and β-cd derivatives, concentrations of the β-cd derivatives and ma enantiomers, ph, and temperature. excellent enantioseparation of ma enantiomers was achieved in the ionic liquid aqueous two-phase extraction systems under the optimal conditions of ph 2.5 and temperature of 5°c with the maximum enantioselectivity (α) of 1.74. the experimental results demonstrated that the ionic liquid aqueous two-phase extraction systems with a β-cd derivative as the chiral selector have a strong chiral recognition ability, which might extend the application of ionic liquids in chiral separation.

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