Selective Separation of Tocopherol Homologues by Liquid−Liquid Extraction Using Ionic Liquids
Selective Separation of Tocopherol Homologues by Liquid−Liquid Extraction Using Ionic Liquids
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DOI：
10.1021/ie801847e
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发表时间：
2009-05
影响因子：
4.2
通讯作者：
Qiwei Yang;Huabin Xing;Yifeng Cao;Bao-gen Su;Yiwen Yang;Qilong Ren
中科院分区：
文献类型：
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作者：
Qiwei Yang;Huabin Xing;Yifeng Cao;Bao-gen Su;Yiwen Yang;Qilong Ren
在稀释剂存在下，以离子液体(ILS)为萃取剂，采用−液萃取法对生育酚同系物进行了选择性分离。测定了生育酚在两相体系中的分配系数和选择性。以[bmim]Cl为萃取剂，经甲醇稀释后，δ-生育酚对α-生育酚的选择性可达21.3。考虑到生育酚的结构差异，提出了基于IL阴离子与生育酚上−羟基氢键相互作用的分离机理。IL的分离效率受阴离子的影响较大，在相同的条件下，分离效率的大小顺序为[bmim]BF4<；[bmim]CF3SO3<；[bmim]Cl，这与IL的氢键碱性强度的递增顺序一致。
Selective separation of tocopherol homologues was performed by liquid−liquid extraction, using ionic liquids (ILs) as extractants in the presence of diluent. The distribution coefficients and selectivities of tocopherols in the biphasic system were determined. A selectivity of δ-tocopherol to α-tocopherol up to 21.3 was achieved when using [bmim]Cl as extractant diluted by methanol. Considering the structural differences of tocopherols, the separation mechanism based on the hydrogen-bonding interaction between IL’s anion and the −OH group on the tocopherols was proposed. The separation efficiency of IL was greatly affected by its anion, and followed the order [bmim]BF4 < [bmim]CF3SO3 < [bmim]Cl under the same conditions, which is consistent with the ascending order of IL’s hydrogen-bond basicity strengths.