STUDIES ON ANTHRAQUINONES FROM THE ROOTS OF RUBIA CORDIFOLIA L.

Seven anthraquinones were isolated from the ethyl alcohol extracts of the roots ofRubia Cordifolia L.. By means of spectrometric data combined with physico-chemical properties, six ofthem wewre identified as 2-methyl-1, 3, 6-trihydroxy-9,10-anthraquinone (Ⅰ), 1-hydroxy-9, 10-anthraquinone (Ⅱ), 1, 2,4-trihydroxy-9, 1 0-anthrequinone (Ⅲ), 2-methyl-1, 3, 6-trihydroxy-9, 10-anthraquinone-3-O-β-D-glucoside(Ⅳ), 1, 2-dijhydroxy-9, 10-anthraquinone-2-O-β-D-xylosyl (1→6)-β-D-glucoside (Ⅴ) and 1,3-dihydroxy-2-hydroxymethy 1-9, 10-anthraquinone-3-O-β-D-xylosyl(1→6)-β-D-glucoside(Ⅵ). Ⅶ is a new compound. Its structure was elucidated to be 2-methyl-1,3,6-trihydroxy-9,10-anthraquinone-3-O-β-D-xylosyl (1→2)-β-D-(6'-O-acetyl)glucoside.