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Effect of the vapour phase on the TLC separation of tropane alkaloids

Gadzikowska M., Jóźwiak G. W., Waksmundzka-Hajnos M.

Acta Chromatographica

2010

Vol. 22, no. 4

515--525

The effect of conditioning the silica layer by mobile phase vapour or ammonia vapour on the retention of alkaloids eluted with non-aqueous mobile phases was examined. The effect of vapour phase composition on system efficiency, peak symmetry, and separation selectivity were also investigated. The most effective and selective systems were used for separation of the alkaloid fraction of Datura innoxia.

Preparative-layer chromatography of an extract of alkaloids from Fumaria officinalis

Jóźwiak G. W., Waksmundzka-Hajnos M.

Acta Chromatographica

2007

No. 18

207-218

A strategy has been established for preparative-layer chromatography of the alkaloid fraction extracted from the plant Fumaria officinalis. The extract, obtained by maceration and percolation of ground plant material with 0.5 mol L-1 aqueous acetic acid, was re-dissolved in methanol and fractionated on alumina by column chromatography. Two fractions, containing medium and high-polarity alkaloids, respectively, were used in the experiments. The effects of mass and volume overloading and the mode of sample application (use of an automatic sample applicator and application to the edge of the layer by use of the mobile-phase distributor of the chromatographic chamber) were investigated, as also was the effect of layer thickness on band resolution. The role of derivatisation in the location of the separated alkaloid bands for isolation was also considered.