Steroidal saponins from the leaves of Agave macroacantha.
A new monodesmosidic spirostanol saponin, along with three known saponins was isolated from Agave macroacantha Zucc leaves. The structure of the new saponin was established as hecogenin-3-O-alpha-L-rhamnopyranosyl (1-->4) beta-D-xylopyranosyl (1-->3)[beta-D-glucopyranosyl (1-->2)] beta-D-glucopyranosyl (1-->4) beta-D-galactopyranoside. The (1)H and (13)C resonances of the four compounds were assigned using a combination of 1D and 2D NMR techniques including (1)H, (13)C, COSY, TOCSY, ROESY, HSQC and HMBC NMR and confirmed by mass spectrometry.
Eskander
Jacqueline
J
Institut de Chimie moléculaire de Reims (ICMR), UMR-CNRS 6229, Reims, France. Jacqueline.eskander@hotmail.com
Lavaud
Catherine
C
Harakat
Dominique
D
D027882:Agave / Q000737:chemistry*; D015394:Molecular Structure; D009844:Oligosaccharides / Q000737:chemistry / Q000302:isolation & purification*; D010936:Plant Extracts / Q000737:chemistry*; D018515:Plant Leaves; D012503:Saponins / Q000737:chemistry / Q000302:isolation & purification*; D013150:Spirostans / Q000737:chemistry / Q000302:isolation & purification*
D009844:Oligosaccharides; D010936:Plant Extracts; D012503:Saponins; D013150:Spirostans