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Chemical investigation of the ethanol extract of the whole plant of Megacodon stylophorus led to the isolation and identification of two new seco-hopane triterpenoids, 2,3-seco-22(29)-hopene-2-carboxyl-3-aldehyde (1) and 2,3-seco-4(23),22(29)-hopene-2-carboxyl-3-aldehyde (2), along with 10 known compounds, 3-12. All the isolates were reported from this plant for the first time. The structures of compounds 1 and 2 were determined by detailed analysis of their spectral data including 1D and 2D NMR. In addition, compound 1 was further analyzed by X-ray crystallography. Compounds 1-3 were evaluated for their in vitro anti-proliferative activities on HeLa, MCF-7, and Hep-G2 tumor cell lines. Compound 2 was active against the three cell lines with IC50 values of 3.6, 7.5, and 13.6 µM, respectively, while compound 1 exhibited cytotoxicity on MCF-7 (IC50 14.0 µM) and HeLa (IC50 18.2 µM) cell lines. Antimicrobial activities of compounds 1-2 (minimum inhibitory concentration values in the range of 3.12-12.50 mg/mL) were also observed.

A phytochemical study of the ethanolic extract of Chrysosplenium carnosum Hook. f. et Thoms. led to the isolation of two new oleanane-type triterpenoids, 6β-hydroxy-3-oxoolean-12-en-27-oic acid (1) and 3β, 21α-dihydroxyolean-12-en-27-oic acid (2), along with fourteen known compounds (3-16), all of which were isolated from this plant for the first time. The structures of these compounds were established on the basis of spectroscopic methods. Compounds 1-4 were evaluated for their in vitro anti-tumor activities on B16F10, SP2/0 and Hep-G2 cells lines. Compounds 1, 3 and 4 exhibited strong inhibitory activity against B16F10 and SP2/0 cells' growth, compared with moderate cytotoxic activity against Hep-G2 cells. However, compound 2 showed to be inactive against these tumor cells.

Phytochemical investigation of the whole plants of Clematis tangutica led to the isolation of three new triterpenoid saponins (1-3), together with four known saponins (4-7). Their structures were determined by extensive spectral analysis and chemical evidences. Compounds 1-7 were evaluated for their cardioprotective activities in cardiomyocytes anoxia/reoxygenation (A/R) model. The results showed that those saponins exhibited cardioprotective effects by decreasing the levels of creatine kinase-MB (CK-MB) and lactate dehydrogenase (LDH).

The anti-proliferative activities against five cancer cell lines of two flavonols (1, 2) with unsubstituted B ring isolated from the ethanol extract of the leaves of Platanus acerifolia were investigated. The results showed that compound 1 possessed a noteworthy anti-proliferative activity against MGC-803 cells with an IC50 value of 17.26±1.04 μM, and compound 2 was less active than 1 with an IC50 value of 20.29±1.37 μM compared with 41.94±1.58 μM for the positive control group. In addition, the results of Hoechst 33258 staining, AO/EB staining and annexinV-FITC assays indicated that 1 caused a significant MGC-803 cellular apoptosis in a dose-dependent manner. The further mechanisms showed that compound 1 induced the production of ROS, decreased the mitochondrial membrane potential, and altered pro- and anti-apoptotic proteins, leading to activation of caspase-9 and caspase-3 in the process of cellular apoptosis. The present investigation indicated that compound 1 could be used as a potential anti-cancer candidate.

isolation and structure determinations of two novel norlathyrane diterpenes, ekanpenoid A (I) and B (II) with potent cytotoxic activities against HeLa and Hep-G2 cell lines

Four new triterpenoid saponins named clematangosides A−D ( 1 – 4 ) along with six known saponins ( 5 – 10 ) were isolated from the whole plants of Clematis tangutica . Their structures were determined by extensive spectral analysis and chemical evidences. All saponins were evaluated for their protective effects in hypoxia-induced myocardial injury model. Compounds 2 – 4, 6 , and 10 exhibited anti-myocardial ischemia activities with ED 50 values in the range of 75.77–127.22 µM.

To establish a quantitative method of simultaneously determination of swertiamarin, gentiopicroside, mangiferin, swertianolin, isoorientin, 1,8-drihydroxy-3-methoxy-xthanone in Swertia from Qinghai province and Sichuan province by HPLC.The samples were separated on the column of Kromasil C18 (4. 6 mm x 250 mm, 5 microm) which eluted with methanol and water (content 0.02% phosphoric acid). The ratio of methanol increased from 20% to 80% during 20-50 min, and from 80% to 100% during 50-60 min, with detected wavelength 254 nm, flow rate at 1 mL x min(-1), column temperature 35 degrees C.Six compounds were base-isolated, the linear ranges of swertiamarin, gentiopicroside, mangiferin, 4-swertianolin, 5-isoorientin, 1,8-drihydroxy-3-methoxy-xthanone were excellent.The method was rapid and precise, and can be use for controlling medicinal materials quality.

To constitute HPLC fingerprint of the methanol extract from Swertia mussotii grown in Sichuan Province.RP-HPLC, methanol and water including 0.02% acid as mobile phase, gradient elution, flow rate 1.0 mL x min(-1), the detection wavelength was 260 nm, temperature was 30 degrees C.The RSD values of peak area and retention time of common peaks in precision, repeatability and stability were lower than 5.0%, respectively, similarity was over 0.805 in S. mussotii collected from 10 different habitats.All results above exhibit that this method is simple, practicable, and reliable as a standard method in controlling the quality of S. mussotii.