Abstract
The phase separation of an aqueous ionic liquid in migration by electrophoresis was utilized for online sample enrichment in microchip electrophoresis. The enrichment of rhodamine 6G in a sample solution was examined to validate the present concept. The peaks of the dye in the electropherograms became sharper and more intense after phase separation in migrating than without phase separation. Optimizing the operating conditions should enable highly target-selective sample enrichment with a higher enrichment factor under microflows.
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