Three new triterpenoid saponins, auriculatusaponins A, B, and C, along with one known saponin, 3-O-beta-glucuronyl-olean-12-en-28-oic acid 28-(O-alpha-rhamnopyranosyl-(1 --> 2)-alpha-arabinopyranosyl) ester were isolated from roots of Aster auriculatus. On the basis of spectral acid chemical evidence, auriculatusaponins A, B, and C were determined as 3 beta-O-beta-glucuronyl-16-oxo-12-ene-28-noroleanane (1), 3 beta-O-beta-glucuronyl-16 alpha-trans-feruloyloxy-12-en-oleanane (3), and 3-O-beta-glucopyranosyl-16 alpha-hydroxy-olean-12-ene-28-oic acid 28-O-carboxymethyl ester (4), respectively.
compositae, triterpenoid saponins, B, Aster auriculatus, auriculatusaponins A, and C, noroleanane
NCBI PubMed ID: 17253218Publication DOI: 10.1055/s-2006-957365Journal NLM ID: 0066751Publisher: George Thieme
Institutions: Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, USA, National Research Council Associate, c/o GED, US EPA Gulf Breeze, USA, The Volcani Center, Agricultural Organization, Bet Dagan, Israel and 4USDA-ARS Western Regional Research Center, Albany, CA, USA
Methods: 13C NMR, 1H NMR, IR, FAB-MS, acid hydrolysis, extraction, optical rotation measurement, elemental analysis, CC, melting point determination, DEPT
Found