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Use of an amphiphilic calix[4]arene with sulfonate functionality at the lower rim as a buffer additive in capillary electrophoresis

Mori M., Hirayama A., Tsue H., Tanaka S.

Acta Chromatographica

2007

No. 19

73-80

An amphiphilic calix[4]arene with sulfonate groups on the lower rim has been investigated as a buffer additive for separation of positional isomers by capillary electrophoresis. Addition of the compound to the run-ning buffer led to successful separation of positional isomers of nitrophenols, dinitrobenzenes, and benzenediols. Association constants between the calixarene and the analytes indicated that size-selective host–guest inter-actions between them played a prominent role in determining the separation behavior.