Four New Triterpenoid Saponins from the Root of Ilex centrochinensis

Two New Compounds Isolated from the Itea omeiensis and Their Anti-oxidant Activities

Two new compounds (1-2) together with ten known compounds (3-12) were isolated for the first time from the 95 % EtOH extract of aerial parts of Itea omeiensis. Their structures were elucidated based on extensive spectroscopic analyses and comparison with published data. The structure of 1 was further confirmed through single-crystal X-ray diffraction analysis, and circular dichroism (CD) spectrum in combination with acid hydrolysis was employed for the absolute configuration determination of 2. Compound 1 was the first 2-arylbenzo[b]furan with an extra six-membered lactone ring from Itea plants. Anti-oxidant assays indicated that compound 1 possessed significant radical scavenging effects on 1,1-Diphenyl-2-picrylhydrazyl (DPPH) and 2,2'-Azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS⋅+ ) with IC50 values of 0.14 and 0.06 mg/mL, respectively, which were comparable to the positive control of ascorbic acid. However, no obvious anti-hepatocellular carcinoma activity was observed for compounds 1 and 2.

Six New Constituents from the Fruit of Hypericum patulum and Their Anti-Inflammatory Activity

Four new xanthone glucosides, 3-hydroxy-2-methoxyxanthone-4-O-β-D-glucopyranoside (1), 4,8-dihydroxy-2-methoxyxanthone-3-O-β-D-glucopyranoside (2), 2-methoxyxanthone-5-O-β-D-glucopyranoside (3), 4-hydroxy-2-methoxyxanthone-3-O-β-D-glucopyranoside (4), a new phenolic acid, 4,4'-dihydroxy-3,3'-imino-di-benzoic acid monomethyl ester (5), and a new isoquinoline, methyl 6-hydroxy-1-oxo-1,2,3,4-tetrahydroisoquinoline-4-carboxylate (6) were isolated from the fruit of Hypericum patulum. The structural elucidation of the isolated compounds was primarily based on HR-ESI-MS, UV, IR, 1D and 2D NMR. All compounds were evaluated for their inhibitory effect against LPS-induced NO production in RAW 264.7 cells. Compound 2, 3 exhibited moderate inhibitory activity against NO production.