期刊
STEROIDS
卷 125, 期 -, 页码 14-19出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.steroids.2017.06.003
关键词
cholestan; Spirostan; Steroidal glycosides; Panicum turgidum; Poaceae; Cytotoxicity
资金
- Fulbright Commission
- National Center for Natural Products Research
- University of Mississippi, USA
Three new bidesmosidic cholestane-type steroidal glycosides, 16-o-beta-D-glucopyranosyl-cholest-5-en-3 beta,16 beta-dio1-22-one-3-o-alpha-L-rhamnopyranosyl-(1 -> 2)-o-[beta-D-glucopyranosyl(1 -> 4)]-o-beta-D-glucopyranoside (1), 16-o-beta-D-glucopyranosylcholest-5-en-3 beta,16 beta-diol-22-one-3-o-alpha-L-rhamnopyranosyl-(1 -> 2)-o-beta-D-glucopyranoside (2), and 16-o-beta-D-glucopyranosylcholestan-3 beta,16 beta-dio1-6,22-dione-3-o-alpha-L-rhainnopyranosyl-(1 -> 2)-o-beta-D-glucopyranosid 3) were isolated from a methanolic extract of Panicum turgidum. In addition four known compounds, pennogenin 3 beta-o-alpha-L-rhamnopyranosyl-(1 -> 2)-O-[alpha-L-rhamnopyranosyl-(1 -> 4)-o-alpha-L-rhamrtopyranosyl-(1 -> 4)]-o-beta-D-glucopyranoside (4), yamogeriin 3 beta-o-alpha-L-rhamnopyranosyl-(1 -> 2)-o-[alpha-L-rhamiiopyranosyl-(1 -> 4)]-o-beta-D-glucopyranoside (5), yamogenin 3 beta-O-alpha-L-rhamnopyranosyl-(1 -> 2)-O-[alpha-L-rhamnopyranosyl-(1 -> 4)-o-alpha-L-rhamnopyranosyl-(1 -> 4)]-o-beta-D-glucopyranoside (6), and pennogenin 3 beta-o-alpha-L-rhamnopyranosyl-(1 -> 2)-o-[alpha-L-rharrmopyranosyl-(1 -> 4)]-o-beta-D-glucopyranoside (7) were also isolated and characterized. Their structures were established using extensive spectroscopic methods including 1D and 2D NMR and HRESIMS. The isolated compounds were screened for cytotoxicity towards a panel of mammalian cell lines and 4-7 were found to be cytotoxic.
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