1-Hexadecyl-3-methylimidazolium Ionic Liquid as a New Cationic Surfactant for Separation of Phenolic Compounds by MEKC |
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Authors: | Jingang Niu Hongdeng Qiu Jing Li Xia Liu Shengxiang Jiang |
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Institution: | 1. Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, CAS, 730000, Lanzhou, China 2. Graduate School of the Chinese Academy of Sciences, CAS, 100039, Beijing, China
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Abstract: | The ionic liquid 1-hexadecyl-3-methylimidazolium bromide (C16MIm]Br) has been used as a novel cationic surfactant for separation of phenolic compounds, including quinol, phloroglucinol, resorcinol, phenol, p-cresol, and m-nitrophenol, by micellar electrokinetic capillary chromatography (MEKC). The effects of buffer concentration and pH, concentration of C16MIm]Br, and applied potential were studied. Use of the optimized buffer (25 mmol L?1 NaH2PO4), 10 mmol L?1 C16MIm]Br, and an applied potential of ?15 kV enables optimum separation with regard to resolution and migration time. The phenolic compounds were detected at 214 nm. The micelle of this long-alkyl-chain imidazolium ionic liquid acts as a pseudo-stationary phase in this MEKC separation. |
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