The effect of chromatographic conditions on the separation of selected alkaloids on CN-silica layers

Selected alkaloids were chromatographed on cyanopropyl-silica thin layers using nonaqueous and aqueous eluents containing various free silanol blocker agents. Because of the strong retention of these basic compounds, nonaqueous eluents containing medium polar diluents, strongly polar modifiers, or aqueous eluents containing organic modifier, water, and silanol blockers (ammonia, diethylamine, and ionic liquid) were required for analysis. Mobile phases containing addition of acids were also tested for separation of investigated alkaloids. The most selective and efficient systems were used in two-dimensional separations of isoquinoline alkaloids’ mixture and plant extracts.