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This work describes the separation of basic aromatic compounds by capillary electrochromatography employing acidic carrier electrolytes and bare silica as well as strong cation-exchange stationary phases. A mixed-mode separation mechanism was involved, comprising chromatographic interactions (adsorption, ion-exchange) as well as electrophoretic migration. The influence of ion-exchange on the retention/migration of the solutes could be manipulated according to procedures commonly employed in ion chromatography. These include variations of the eluting strength and/or the concentration of the competing ion present in the background electrolyte. Using this approach, separation times could be shortened and changes in selectivity could be achieved for a number of analytes.

Item Type:	Refereed Article
Keywords:	Aniline; Toluidines; Pyridine; Benzylamine; Aminopyridines;Electrochromatography; Background electrolyte composition; Mixed-mode chromatography
Research Division:	Chemical Sciences
Research Group:	Analytical Chemistry
Research Field:	Separation Science
Objective Division:	Expanding Knowledge
Objective Group:	Expanding Knowledge
Objective Field:	Expanding Knowledge in the Chemical Sciences
Author:	Klampfl, CW (Dr Christian Klampfl)
Author:	Haddad, PR (Professor Paul Haddad)
ID Code:	19327
Year Published:	2000
Web of Science® Times Cited:	24
Deposited By:	Chemistry
Deposited On:	2000-08-01
Last Modified:	2010-02-20
Downloads:	0