VEGETABLE PURGATIVES CONTAINING ANTHRACENE DERIVATIVES: Part VIII.—The Paper Chromatography of Certain Anthraquinones and their Glycosides

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Abstract
A simple paper chromatographic technique, using toluene alone as a running solvent, is described for identifying free anthraquinone compounds in crude drugs. A second system is described for anthraquinone glycosides: the running solvent is the lower aqueous phase of a water: acetone: benzene mixture. This system was found particularly successful for cascara bark Rhamnus purshiana D.C. as it readily revealed the presence of at least three anthraquinone glycosides.