A new flavonoid with an aryl moiety from Selaginella uncinata / 中国中药杂志

The present study is to investigate the chemical constituents of the whole plants of Selaginella uncinata. A new flavonoid was isolated from the 75% ethanol extract of Selaginella uncinata by column chromatographies over macroporous resin, silica gel, Sephadex LH-20 and prep-HPLC. The structure was elucidated as 8-[4-(carboxyl)phenoxy]-5,4'-dihydroxy-7-methoxyflavanone (1) and named unciflacone G.

Flavonoids from Selaginella uncinata / 中国中药杂志

In the current study, nine flavonoids were isolated and purified from 75% ethanol extract of Selaginella uncinata (Desv.) Spring by column chromatographic techniques over macroporous resin, polyamide, silica gel, Sephadex LH-20 and pre-HPLC. On the basis of their physico-chemical properties and spectroscopic data analyses, these compounds were elucidated as cirsimarin (1), nepitrin (2), apigenin-6-C-α-L-arabinopyranosyl-8-C-β-D-glucopyranoside (3), apigenin-6-C-β-D-glucopyranosyl-8-C-α-L-arabinopyranoside (4), apigenin-7-O-β-D-glucopyranoside (5), 2,3-dihydroamentoflavone (6), 4'-O-methylamentoflavone (7), 2,3-dihydro-4'-O-methyl-amentoflavone (8), and 2,3,2",3"-tetrahydron-4'-O-methyl-robustaflavone (9). Compounds 1-5 belong to flavonoid glycosides and were isolated from the genus Selaginella for the first time.

Studies on constituents of Oldenlandia diffusa / 中国中药杂志

<p><b>OBJECTIVE</b>To investigate the chemical constituents of Oldenlandia diffusa.</p><p><b>METHOD</b>The column chromatography with polyamide Sephadex LH -20, silica gel as packing materials and HPLC, were used to separate and purify the chemical components. The structures were elucidated on the basis of physicochemical properties and spectral data.</p><p><b>RESULT</b>Nine compounds were isolated and identified as 2, 6-dihydroxy-1-methoxy-3-methylanthraquinone (1), 2-hydroxy-1-methoxy-3-methylanthraquinone (2), 2-hydroxy-3-methylanthraquinone (3), quercetin-3-O-[2-O-(6-O-E-sinapoyl)-beta-D-glucopyranosyl]-beta-glucopyranoside (4), quercetin-3-O-[2-O-(6-O-E-feruloyl)-beta-D-glucopyranosyl]-beta-glucopyranoside (5), kaempferol-3-O-[2-O-(6-O-E-feruloyl)-beta-D-glucopyranosyl]-beta-galactopyranoside (6), quercetin-3-O-(2-O-beta-D-glucop-yranosyl)-beta-D-glucopyranoside (7), rutin (8) and quercertin (9).</p><p><b>CONCLUSION</b>Compounds 1 and 8 were obtained from this plant for the first time, and compound 1 was a new compound.</p>

A new xanthone from Polygala aureocauda Dunn / 药学学报

<p><b>AIM</b>To study the chemical constituents of Polygala aureocauda Dunn..</p><p><b>METHODS</b>Chemical compounds were isolated by column chromatography and their structures were determined mainly by spectroscopic means (UV, IR, MS, 1HNMR, 13CNMR, HMQC, HMBC).</p><p><b>RESULTS</b>Three compounds were isolated and identified as 3-hydroxy-1,4-dimethoxyxanthone (I), 1, 7-dihydroxy-2, 3-methylendioxyxanthone (II), 7-hydroxy-1-methoxy-2, 3-methylendioxyxanthone (III).</p><p><b>CONCLUSION</b>Compounds I-III were isolated from Polygala aureocauda Dunn. for the first time, whereas compound I is a new xanthone.</p>

Water-soluble chemical constituents of Swertia davidi Franch / 药学学报

<p><b>AIM</b>To study the active constituents of Swertia davidi Franch.</p><p><b>METHODS</b>Column chromatographies on silica gel, Sephadex LH-20 and Diaion-201 et al. were used to isolate and purify the chemical components. Their structures were identified by UV, IR, MS, NMR and 2D-NMR.</p><p><b>RESULTS</b>These compounds were elucidated as 8-O-beta-D-glucopyranosyl-1, 3, 5-trihydroxyxanthone (I), 5-O-beta-D-glucopyranosyl-1, 8-dihydroxy-3-methoxyxanthone (II), 5-O-beta-D-glucopyranosyl-1, 3, 8-trihydroxyxanthone (III) and swertamarin (IV).</p><p><b>CONCLUSION</b>Compound III is a new xanthone glucoside. The other compounds were isolated from this plant for the first time.</p>

Daviditin B from Swertia davidi Franch / 药学学报

<p><b>AIM</b>To study the active constituents of Swertia davidi Franch.</p><p><b>METHODS</b>Chemical components were isolated by column chromatography and their structures were established mainly by spectroscopic means (UV, IR, NMR, 2D-NMR, MS).</p><p><b>RESULTS</b>Three substances were identified as 2,5-dimethoxyl-1, 4-dicarboxyl benzene (VIII), 1,5,8-trihydroxyl-3,4-dimethoxyl xanthone (IX) and 1,8-dihydroxyl-3-(3'-hydroxyl-butoxy) xanthone (X).</p><p><b>CONCLUSION</b>Compounds VIII and IX were isolated from Swertia davidi Franch, for the first time, whereas compound X is a new xanthone, named daviditin B with antioxygenated activity in vitro.</p>

Studies of the chemical constituents of Swertia davida Franch / 药学学报

<p><b>AIM</b>To study the active constituents of Swertia davidi Franch..</p><p><b>METHODS</b>Chromatography was used to isolate and purify the chemical components, their structures were identified by spectral analysis.</p><p><b>RESULTS</b>Three compounds were identified as 1,7-dihydroxy-3,8-dimethoxyxanthone (gentiacaulein) (V), 1,8-dihydroxy-3,7-dimethoxyxanthone (methylswertianin) (VI) and 1,8-dihydroxy-3,4,7-trimethoxyxanthone (VII).</p><p><b>CONCLUSION</b>Compound VII is a novel xanthone, named daviditin A, the others were isolated from Swertia davidi Franch. for the first time.</p>