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[Studies on water-soluble constituents of Echinacea prupurea]
Ji-ren Li1, Bin Wang, Liang Qiao
1Department of Natural Medicine, School of Pharmaceutical Sciences, Peking University, Beijing 100083, China.
Aim:
To study the water-soluble constituents of Echinacea purpurea.
Methods:
The compounds were isolated by chromatography method and their structures were identified on the basis of spectral analyses.
Results:
Five compounds were identified as 2-(4-hydroxylphenyl)-ethyl-O-alpha-L-rhamnopy-ranoasyl-(1-->6)-beta-D- glucopyranoside, named echipuroside A 1); (6S, 9R)-6-hydroxy-3-one-alpha-inonol-9-O-beta-D-glucopyranoside 2), ampelopsisionoside 3); phenylmethyl-6-O-beta-D-xylopyranosyl(1-->6)-beta-D-glucopyranoside 4) and phyenylmethyl-beta-D-glucopyranoside 5).
Conclusion:
Compound 1 is a new compound, the others were isolated from this plant for the first time.