ABSTRACT
Seven compounds were isolated from Onychium japonicum by macroporous resin, silica gel, ODS, Sephadex LH-20 column chromatography and semi-preparative HPLC. Their structures were identified by NMR, MS and other spectroscopic methods as onychone A (1), quercetin (2), quercetin-3-O-α-L-rhamnoside (3), kaempferol-7-O-β-D-glucopyranoside (4), kaempferol-3-O-α-L-rhamnopyranoside (5), (-)-prunin (6), and norathyriol (7). Compound 1 is a novel macrocyclic flavonoid, and all the others are reported from this plant for the first time. In vitro cytotoxic activities of compounds 1-7 were evaluated by MTS testing with five cancer cell lines. Compound 7 exhibited weak cytotoxicity against tumor cell lines A549, SMMC-7721, and SW480.
ABSTRACT
Objective: To study chemical constituents of Argyreia acuta. Methods: The chemical constituents were isolated and purified by silica gel, macroporous resin adsorption, MCI GEL CHP 20P, Sephadex LH-20 chromatography, and preparative liquid chromatography. Their structures were identified by physicochemical properties and spectral analysis. Results: Ten compounds were isolated and identified as ethyl caffeate (1), hispidulin (2), quercetin (3), scopolin (4), paprazine (5), mannitol (6), hesperetin (7), ipalbidinium-4’-O-β-D-(6-O-trans-coumaroyl)-glucoside (8), nepitrin (9), and homoplantaginin (10). Conclusion: Compound 8 is a new compound named argyreiacutine, and compounds 2, 3, 6, 7, 9, and 10 are isolated from A. acuta for the first time.
ABSTRACT
Objective: To study the chemical constituents of Gynostema pentaphyllum. Methods: The chemical constituents were isolated and purified by silica gel, polyamide, and Sephadex LH-20 chromatography. Their structures were elucidated by physicochemical properties and spectral analysis. Results: Seventeen compounds were isolated and identified as dodecanoic acid (1), β-sitosterol (2), 3, 3', 5-trihydroxy-4', 7-dimethoxyflavanone (3), 1-2-benzenediol (4), 3'-O-methyltaxifolin (5), quercetin (6), rhamnetin (7), α-spinasterol-3-O-β-D-glucopyranoside (8), 3, 4-dihydroxy benzoic acid (9), narcissoside (10), L-rhamnosemono-hydrate (11), malonic acid (12), β-ethoxy-rutinoside (13), rutin (14), ombuoside (15), ginsenoside Rb1 (16), and β-daucosterol (17). Conclusion: Compound 1, 3-5, 7, 9, 10, and 12 are obtained from G. pentaphyllum for the first time.
ABSTRACT
Objective: To study the chemical constituents in the stems of Zhuang Medicine Alsophila spinulosa. Methods: The chemical constituents were isolated and purified by silica gel, polyamide, and Sephadex LH-20 column chromatography. Their structures were elucidated by physicochemical properties and spectral analyses. Results: Sixteen compounds were isolated from the 50% and 95% ethanol extracts and identified as 30-O-β-D-xylopyranosyl-dryocrassol (1), pimaric acid (2), 9α-hydroxy-1β-methoxycaryolanol (3), 6β-hydroxy-24-ethyl-cholest-4-en-3-one (4), 1-O-hexadecanolenin (5), clovandiol (6), decumbic acid (7), n-tetracosane (8), 4-O-β-D-glucopyranosyl-p-coumaric acid (9), (E)-4-O-β-D-glucopyranosyl caffeic acid (10), cyathenosin A (11), protocatechualdehyde (12), protocatechuic acid (13), stigmastane-3, 6-dione (14), β-sitosterol (15), and daucosterol (16). Conclusion: Compound 1 is a new compound named alspineoside A, and compounds 2-11 are isolated from the stems of A. spinulosa for the first time.