Abstract
Echinacoside and verbascoside possess a spectrum of significant beneficial bioactivities. A new method of preparative high-speed counter-current chromatography for rapid separation and purification of verbascoside from the leaves of Penstemon barbatus (Cav.) Roth was introduced. The solvent system employed here was n-butanol–water (1:1, v/v). The structure was confirmed by IR, 1H NMR and 13C NMR. According to the quantification results, echinacoside and verbascoside were found to be as much as 5.25±0.13mg/g and 11.21±0.16mg/g, respectively, in the leaves of P. barbatus. This indicates that P. barbatus might be an ideal alternative resource for large scale preparation of echinacoside and verbascoside.
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