A novel C27-steroidal glycoside sulfate from Liriope graminifolia / 药学学报

An unusual novel C27-steroidal glycoside sulfate was isolated from the underground organs of Liriope graminifolia (Linn.) Baker with three known compounds. Their chemical structures were determined by spectral analysis, including HR-MS, 1D and 2D NMR as (25S)-ruscogenin 1-sulfate-3-O-alpha-L-rhamnopyranoside (1), (25S)-ruscogenin 1-O-beta-D-xylopyranosyl-3-O-alpha-L-rhamnopyranoside (2), hesperidin (3), and 4', 7-dihydroxy-5-methoxyflavanone (4). Compound 1 has cytotoxic activities against K562 and HL60 cells with IC50 values of 18.6 microg x mL(-1) and 16.5 microg x mL(-1), respectively.

Study on triterpenes of Microtropis tiflora / 中国中药杂志

<p><b>OBJECTIVE</b>To study the chemical constituents of Microtropis triflora.</p><p><b>METHOD</b>The compounds were isolated by chromatography on silica gel and Sephadex LH-20. There structures were elucidatedby by chemical methods and spectral analysis.</p><p><b>RESULT</b>Five triterpenoids were isolated and elucidated as friedelin (1), 3-oxo-28-friedelanoic acid (2), 29-hydroxy-3-friedelanone (3), salaspermic acid (4), orthosphenic acid (5).</p><p><b>CONCLUSION</b>Compounds 1-5 are all isolated from M. triflora for the first time.</p>

Antitumor effects of novel triterpene from Celastrus hypoleucus on human colorectal cancer cell line RKO in vitro / 中国中药杂志

<p><b>OBJECTIVE</b>To investigate the effects of novel triterpene (12-oleanene-3beta, 6alpha-diol) from Celastrus hypoleucus on the proliferation and apoptosis of human colorectal cancer cell line RKO.</p><p><b>METHOD</b>The inhibitory effect of the novel triterpene on RKO cell proliferation was assayed by MTT dye reduction. The morphology of apoptotic cells was observed with AO/EB double fluorescence staining and HE staining, DNA fragment with electrophoresis on agarose gels, sub-diploid peak and cell cycle with flow cytometer (FCM).</p><p><b>RESULT</b>Novel triterpene (12-oleanene-3beta, 6alpha-diol) from C. hypoleucus significantly inhibited proliferation of RKO cells in dose-dependent and time-dependent manner, the IC50 was (12.20 +/- 0.79) microg x mL(-1) at 48 h. Typical apoptotic changes were observed in RKO cells under the fluorescence microscope and the light microscope. DNA ladder was detected on agarose gels at concentrations from 10 microg x mL(-1) to 20 microg x mL(-1) at 48 h. With FCM methods, dose-dependent apoptosis-induced effect was observed in RKO cell line after treatment of triterpene for 48 h, and the apoptotic rates were increased from(2.93 +/- 0.84) % to (50.79 +/- 6.61) % at concentrations from 2.5 microg x mL(-1) to 20 microg x mL(-1). DNA histograms data from FCM analysis showed that the number of cells was obviously reduced during G0-G1 phase and G2-M phase, but not during S phase for RKO cell line after treatment with various concentrations of the triterpene for 48 hours.</p><p><b>CONCLUSION</b>Novel triterpene (12-oleanene-3beta, 6alpha-diol) from C. hypoleucus can induce apoptosis and has inhibition effect on the proliferation in RKO cell line.</p>

Chemical shift assignments of two oleanane triterpenes from Euonymus hederaceus / 浙江大学学报（英文版）（B辑：生物医学和生物技术）

(1)H-NMR and (13)C-NMR assignments of 12-oleanene-3,11-dione (compound 1) were completely described for the first time through conventional 1D NMR and 2D shift-correlated NMR experiments using (1)H-(1)HCOSY, HMQC, HMBC techniques. Based on its NMR data, the assignments of 28-hydroxyolean-12-ene-3,11-dione (compound 2) were partially revised.