Saponins from Ilex dumosa, an erva-mate (Ilex paraguariensis) adulterating plant.

摘要

Extraction of I. dumosa leaves, a material frequently used for the adulteration of the mildly stimulant South American beverage, erva-mate, resulted in the isolation of 3-O-beta-D-glucuronopyranosyl-28-O-beta-D-glucopyranosyl-3beta-hydroxyolean-12-en-28-oic acid, 3-O-beta-D-6-O-methylglucuronopyranosyl-28-O-beta-D-glucopyranosyl-3beta-hydroxyolean-12-en-28-oic acid, and three new saponins: 3-O-[beta-D-glucopyranosyl-(1-2)-beta-D-galactopyranosyl]-28-O-beta-D-glucopyranosyl-3beta,29-dihydroxyolean-12-en-28-oic acid, 3-O-[alpha-L-arabinopyranosyl-(1-2)-alpha-L-arabinopyranosyl]-28-O-beta-D-glucopyranosyl-3beta-hydroxyolean-12-en-28-oic acid, 3-O-beta-D-galactopyranosyl-28-O-beta-D-glucopyranosyl-3beta-hydroxyolean-12-en-28-oic acid. None of these saponins are present in the leaves of I. paraguariensis (genuine erva-mate).