Four new C-21 steroidal glycosides from the roots of and their immunological activities
摘要:
Four new C-21 steroidal glycoside, stemucronatosides D (1), E (2), F (3), and G (4) were isolated from the roots of Stephanotis mucronata. Their structures were determined on the basis of chemical evidence and extensive spectroscopic methods including one-dimensional and two-dimensional NMR. These isolated compounds were assayed for their immunological activities in vitro against concanavalin A (Con A)and lipopolysaccharide (LPS)-induced proliferation of mice splenocytes. Compounds 1, 2, and 4 showed inummosuppressive activities in a dose-dependent manner, while compound 3 showed immunomodulating activities. (c) 2005 Elsevier Inc. All rights reserved.
Steroidal glycosides from the aerial part of Asclepias incarnata
作者:Tsutomu Warashina、Tadataka Noro
DOI:10.1016/s0031-9422(99)00560-9
日期:2000.2
The aerialpart of Asclepias incarnata afforded 34 pregnane glycosides. These were confirmed to have lineolon, isolineolon, ikemagenin, 12-O-nicotinoyllineolon, deacylmetaplexigenin, metaplexigenin, rostratamine, 12-O-acetyllineolon, 15beta-hydroxylineolon and 15beta-hydroxyisolineolon moieties as their aglycones, and 2.6-dideoxyhexopyranose, glucopyranose and allopyranose as the corresponding sugar