title: Complete (1)H and (13)C assignments of the four major saponins from Dioscorea villosa (wild yam).
abstract: Complete (1)H and (13)C spectral assignments for the four major steroidal saponins isolated by methanolic extraction of the roots of Dioscorea villosa, collected in North Carolina, United States (in summer and autumn), are presented in this paper. The structures were determined by a combination of (1)H, (13)C and 2D NMR techniques and were found to be ((3beta,25R)-26-(beta-D-glucopyranosyloxy)-22-methoxyfurost-5-en-3-yl-O-beta-D-glucopyranosyl-(1 --> 3)-O-beta-D-glucopyranosyl-(1 --> 4)-O-[alpha-L-rhamnopyranosyl-(1 --> 2)]-beta-D-glucopyranoside (1) (or methyl parvifloside), ((3beta,25R)-26-(beta-D-glucopyranosyloxy)-22 methoxyfurost-5-en-3-yl-O-alpha-L-rhamnopyranosyl-(1 --> 2)-O-[beta-D-gluco- pyranosyl-(1 --> 4)]-beta-D-glucopyranoside (2) (or methyl protodeltonin), (3beta,25R)-spirost-5-en-3-yl-O-beta-D-glucopy ranosyl-(1 --> 3)-O-beta-D-glucopyranosyl-(1 --> 4)-O-[alpha-L-rhamnopyranosyl-(1 --> 2)]-beta-D-glucopyranoside (3) (or Zingiberensis saponin I) and (3beta,25R)-spirost-5-en-3-yl-O-alpha-L-rhamnopyranosyl-(1 --> 2)-O-[beta-Ds-glucopyranosyl -(1 --> 4)]-beta-D-glucopyranoside (4) (or deltonin).
authors: Chemistry, SMMS, The University of Queensland, Australia.
authors: Patricia Y
authors: PY
authors: Hayes
authors: Lynette K
authors: LK
authors: Lambert
authors: Reg
authors: R
authors: Lehmann
authors: Kerry
authors: K
authors: Penman
authors: William
authors: W
authors: Kitching
authors: James J
authors: JJ
authors: De Voss
mesh_terms: D002240:Carbohydrate Sequence; D002247:Carbon Isotopes; D027742:Dioscorea / Q000737:chemistry*; D008969:Molecular Sequence Data; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods; D011522:Protons; D012503:Saponins / Q000737:chemistry*
chemical_list: D002247:Carbon Isotopes; D011522:Protons; D012503:Saponins