Anti-inflammatory sesquiterpene polyol esters from the stem and branch of Tripterygium wilfordii / 中国天然药物

The stem and branch extract of Tripterygium wilfordii (Celastraceae) afforded seven new dihydroagarofuran sesquiterpene polyesters [tripterysines A-G (1-7)] and eight known ones (8-15). The chemical structures of these new compounds were established based on combinational analysis of HR-ESI-MS and NMR techniques. The absolute configurations of tripterysines A-C (1-3) and E-G (5-7) were determined by X-ray crystallographic analysis and circular dichroism spectra. All the compounds were screened for their inhibitory effect on inflammation through determining their inhibitory effect on nitric oxide production in LPS-induced RAW 264.7 cells and the secretion of inflammatory cytokines TNF-α and IL-6 in LPS-induced BV2 macrophages. Compound 9 exhibited significant inhibitory activity on NO production with an IC50 value of 8.77 μmol·L-1. Moreover, compound 7 showed the strongest inhibitory effect with the secretion of IL-6 at 27.36%.

Chemical constituents contained in roots of Pterospermum heterophyllum / 中国中药杂志

<p><b>OBJECTIVE</b>To study chemical constituents of contained in roots of Pterospermum heterophyllum.</p><p><b>METHOD</b>The chemical constituents of P. heterophyllum were separated and purified by silica gel, sephadex LH-20, ODS column chromatography and preparative HPLC. Their structures were identified by spectroscopic techniques.</p><p><b>RESULT</b>Ten compounds were separated and identified as asperglaucide (1), 2-methoxy4-hydroxyphenol-1-O-beta-D-apiofuranosyl (1-->6)-O-beta-D-glucopyranoside (2), 5, 5'-dimethoxy-9-beta-D-xylopyranosyl-(-) -isolariciresinol(3), (-)-epicatechin (4), eriodictyol (5), taxifolin (6), 3beta-hydroxy-12-en-28-ursolic acid (7), 2beta, 3beta-dihydroxy-12-en-28-oleanolic acid (8), quercetin (9), cholest-4-en-3-one (10).</p><p><b>CONCLUSION</b>Compounds 1-10 were separated from this plant for the first time.</p>

Cytotoxic sesquiterpene lactones from Berlandiera lyatra / 中草药

Objective To study the antitumor natural products from Berlandiera lyatra. Methods Compounds were isolated by liquid/liquid partition and chromatography on Sephadex LH20 and silica gel columns. All process of the fractionation were run with the guidance of cytotoxicity bioassay by MTT method against three human cancer cell lines. The chemical structures of bio-active compounds were identified on the basis of spectroscopic data. Results From the CHCl3-soluable fraction of the title plant, two cytotoxic compounds were isolated. They were determined as 3α-epoxypumilin and pumilin. Conclusion 3α-epoxypumilin and pumilin were responsible major compounds for the cytotoxicity in the methanolic extract of the plant. Both compounds were isolated from the B. lyatra and were reported to be of antitumor activity for the first time.

Ceramides and cerebrosides from Bugula neritina / 中国海洋药物

Objective To study the chemical constituents from Bugula sp.Methods Compounds were isolated by organic solvent extraction,sephadex-LH-20column chromatography and silica gel column.Their chemical structures were identified on the basis of spectroscopic data.Results From the CH_(2)Cl_(2)-suluable extract of Bugula sp.,eight ceramides or cerebrosides(1~8) were isolated,and their structures were determined.Conclusion All the compounds were isolated for the first time from Bugula sp..

Chemical constituents from stem bark of Daphne giraldii / 中草药

Objective To study the chemical constituents from the stem bark of Daphne giraldii. MethodsThe chemical constituents in the alcoholic extract from the stem bark of D. giraldii were isola-ted and purified using liquid/liquid extraction and silica gel column chromatography. The structures of the isolated compounds were determined on the basis of NMR, and mass spectra. ResultsSeven compounds were isolated from the alcohol extract. Their structures were identified as E-octadecyl caffeinate (Ⅰ), (+)-nortrachelogenin (Ⅱ), daphnoretin (Ⅲ), daphneticin (Ⅳ), 7, 8-dihydroxy coumarin (Ⅴ), 7-hydroxy coumarin (Ⅵ), and luteolin (Ⅶ) on the basis of 1H-NMR, 13C-NMR, and MS. ConclusionCompound Ⅰ is a new one. Compounds Ⅱ, Ⅳ, and Ⅶ are isolated from the title plant for the first time.

Study on biflavonoids from stem bark of Daphne giraldii / 中草药

Object To isolate and identify the biflavonoids from the stem bark of Daphne giraldii Nitsche. Methods The flavonoids were isolated and purified by column chromatography on silica gel and Sephadex LH-20. Their structures were determined by spectroscopic methods, including IR, 1HNMR, 13 CNMR, HMBC and FAB-MS.Results Four biflavonoids daphnodorins A-D 1 (Ⅰ-Ⅳ) were isolated from the stem bark of D. giraldii. Conclusion The above four biflavonoids were isolated from the title plant only.

Studies on chemical constituents from Semiliquidambar cathayensis / 中草药

Object To isolate and identiified the chemical constituents from the EtOAc soluble fraction of the rhizome of Semiliquidambar cathayensis Chang with anti inflammatory activity Methods The EtOAc soluble fraction of anti inflammatory activity was determined on the basis of the mouse ear irritant assay by croton oil The chemical constituents were isolated by silica gel column chromatography, and their structures were identiified by IR, MS and NMR spectroscopic methods including HMQC and HMBC experiments Results Four oleanolic acid derivatives, oleanolic acid, 3 oxo olean 12 en 28 oic acid 2?, 3? dihydroxyolean 12 en 28 oic acid, 2?, 3?, 23 trihydroxyolean 12 en 28 oic acid (arjunolic acid); three ellagic acid derivatives, ellagic acid 3, 3′ dimethylether, ellagic acid 3, 3′, 4 trimethylether, and ellagic acid 4 O ? D xylopyranoside 3, 3′ dimethylether, together with ? sitosterol and octadecylic acid were obtained and identified Conclusion All the nine compounds were isolated for the first time from the title plant