Ionic liquids as electrolytes for nonaqueous capillary electrophoresis.
Acetonitrile is a well-suited medium for nonaqueous capillary electroseparations and enables extending the range of applications of capillary electrophoresis (CE) techniques to more hydrophobic species. In this study, the dialkylimidazolium-based low temperature melting organic salts know as "ionic liquids" (ILs) are used as electrolytes. At room temperature these liquids are miscible with acetonitrile which makes it easy to use them for adjustment of analyte mobility and separation. The anionic part as well as the concentration of an IL influence the general electrophoretic mobility of the buffer system. The separation of different analytes is achieved because they become charged in the presence of ILs in separation media. There is also a possibility for a complex formation between the solute and the electrolyte which alters the mobility of the solute. A selected application of separations of phenols and aromatic acids will be discussed.
Vaher
Merike
M
Department of Analytical Chemistry, Institute of Chemistry at Tallinn Technical University, Tallinn, Estonia. merike@chemnet.ee
Koel
Mihkel
M
Kaljurand
Mihkel
M
D004573:Electrolytes; D019075:Electrophoresis, Capillary / Q000379:methods*; D007093:Imidazoles; D007477:Ions
D004573:Electrolytes; D007093:Imidazoles; D007477:Ions