Journal
ANALYTICA CHIMICA ACTA
Volume 714, Issue -, Pages 20-37Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2011.11.045
Keywords
Ionic liquids; Surface confined ionic liquids; Stationary phases; High-performance liquid chromatography
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Funding
- Spanish Ministry of Innovation and Science (MICINN) [CTQ2008-06253/BQU]
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Ionic liquids (ILs) are a class of ionic. nonmolecular solvents which remain in liquid state at temperatures below 100 degrees C. ILs possess a variety of properties including low to negligible vapor pressure, high thermal stability, miscibility with water or a variety of organic solvents, and variable viscosity. IL-modified silica as novel high-performance liquid chromatography (HPLC) stationary phases have attracted considerable attention for their differential behavior and low free-silanol activity. Indeed, around 21 surface-confined ionic liquids (SCIL) stationary phases have been developed in the last six years. Their chromatographic behavior has been studied, and, despite the presence of a positive charge on the stationary phase, they showed considerable promise for the separation of neutral solutes (not only basic analytes), when operated in reversed phase mode. This aspect points to the potential for truly multimodal stationary phases. This review attempts to summarize the state-of-the-art about SCIL phases including their preparation, chromatographic behavior, and analytical performance. (C) 2011 Elsevier B.V. All rights reserved.
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