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Showing papers on "Isovitexin published in 1976"


Journal ArticleDOI
TL;DR: In this paper, the position of arabinose on the C-glucoside moiety of the flavone was established by 13C-NMR spectroscopy.
Abstract: Identification of xanthones and new arabinosides of flavone C-glucosides from Swertia perennis L. – Seven tetraoxygenated xanthones [1,3,7,8-tetrahydroxy-xanthone (1); 1,8-dihydroxy-3,7-dimethoxy-xanthone (2); 1,7-dihydroxy-3,8-dimethoxy-xanthone (3); 1-hydroxy-3,7,8-trimethoxy-xanthone (4); 3,7,8-trihydroxy-xanthone-xanthone-1-0-β-glucoside (5); 3,7,8-trimethoxy-xanthone-1-0-primeveroside (6); 8-hydroxy-3,7-dimethoxy-xanthone-1-0-primeveroside (7)] have been isolated chromatographically, using polyamide columns, from roots of Swertia perennisL. From leaves and stems of the same plant, six xanthones [1,5,8-trihydroxy-3-methoxy-xanthone (8); 1,5-dihydroxy-3-methoxy-xanthone-8-0-β-glucoside (9); mangiferin (10); 1; 4; 5] and four flavone C-glycosides [iso-orientin (11); isovitexin (12); iso-orientin-6″-arabinoside (13); isovitexin-6″-arabinoside (14)] have also been isolated. Among these compounds, 7, 13 and 14 were not encountered before in nature. In the last two compounds, the position of arabinose on the C-glucoside moiety of the flavone was established by 13C-NMR. spectroscopy.

40 citations



Journal ArticleDOI
TL;DR: In this paper, a 2.5-gluco-isovitexin from wood sorrel (Oxalis acetosella L.) was isolated in a yield of 0.85%.
Abstract: Aus den oberirdischen Pflanzenteilen des Sauerklees (Oxalis acetosella L.) wurde 2″-Gluco-isovitexin (4) in 0.85 proz. Ausbeute isoliert. Die Konstitution konnte fur diese Verbindung als 2″-O-(β-D-Glucopyranosyl)isovitexin gesichert werden. On 2″-Gluco-isovitexin from Wood Sorrel (Oxalis acetosella L.) From the above ground parts of wood sorrel (Oxalis acetosella L.) 2″-gluco-isovitexin (4) was isolated in a yield of 0.85%. The constitution has been secured as 2″-O-(β-D-glucopyranosyl)isovitexin.

7 citations


Journal ArticleDOI
TL;DR: In this paper, the position of arabinose on the C-glucoside moiety of the flavone was established by 13C-NMR spectroscopy.
Abstract: Identification of xanthones and new arabinosides of flavone C-glucosides from Swertia perennis L. – Seven tetraoxygenated xanthones [1,3,7,8-tetrahydroxy-xanthone (1); 1,8-dihydroxy-3,7-dimethoxy-xanthone (2); 1,7-dihydroxy-3,8-dimethoxy-xanthone (3); 1-hydroxy-3,7,8-trimethoxy-xanthone (4); 3,7,8-trihydroxy-xanthone-xanthone-1-0-β-glucoside (5); 3,7,8-trimethoxy-xanthone-1-0-primeveroside (6); 8-hydroxy-3,7-dimethoxy-xanthone-1-0-primeveroside (7)] have been isolated chromatographically, using polyamide columns, from roots of Swertia perennisL. From leaves and stems of the same plant, six xanthones [1,5,8-trihydroxy-3-methoxy-xanthone (8); 1,5-dihydroxy-3-methoxy-xanthone-8-0-β-glucoside (9); mangiferin (10); 1; 4; 5] and four flavone C-glycosides [iso-orientin (11); isovitexin (12); iso-orientin-6″-arabinoside (13); isovitexin-6″-arabinoside (14)] have also been isolated. Among these compounds, 7, 13 and 14 were not encountered before in nature. In the last two compounds, the position of arabinose on the C-glucoside moiety of the flavone was established by 13C-NMR. spectroscopy.

2 citations



Journal ArticleDOI
TL;DR: In this article, seven flavonoids were identified from leaves of Polygonum offine D. Don by means of polyamide column, ion exchange and thick layer chromatography.

1 citations