کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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5555032 | 1559624 | 2017 | 11 صفحه PDF | دانلود رایگان |
Bioassay-guided fractionation of the ethanolic extract of the stem bark of Albizia julibrissin led to the isolation of ten new oleanane-type triterpenoid saponins, julibrosides J37-J46 (1-10), along with six known analogues (11-16). In addition, 11 prosapogenins (17-27) were prepared by mild or strong alkaline hydrolysis of the total saponin. The structures of 1 â 27 were determined by spectroscopic and chemical means, and their cytotoxicities against four human cancer cell lines, BGC-823, A549, HCT-116, and HepG2 were evaluated. Compounds 5-16 exhibited significant inhibitory activity with IC50 values ranging from 2.59 to 9.30 μM, and 8 turned out to be the most active compound with all IC50 values < 5 μM. A preliminary structure-activity relationship of these saponins clearly indicated that the outer monoterpenoid moiety (MTâ²) is a crucial substituent for cytotoxicity, and the linkage sites of the MTâ² unit greatly influenced the activity. It could also be inferred that the existence of 16-OH of the aglycone almost has no effect on cytotoxicity and the N-acetyl-glucosamine moiety at C-3 seems to enhance activity.
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Journal: Fitoterapia - Volume 121, September 2017, Pages 183-193