Saponins from the roots of Chiococca alba and their in vitro anti-inflammatory activity

摘要

Five triterpenoidal saponins were isolated from the roots of Chiococca alba (L.) Hitchc. (Rubiaceae). Two of the saponins, chiococcasaponin III (3-O-beta-d-glucopyranurosyl-30-hydroxyolean-12,15-dien-28-oic acid 28-0-beta-d-xylopyranosyl (1 -> 4)-alpha-l-rhamnopyranosyl (1 —> 2)-alpha-l-arabinopyranosyl ester) and chiococcasaponin IV (3-0-P-d-glucopyranurosyl-3beta-hydroxyolean-12,15-dien-28-oic acid 28-O-alpha-l-rhamnopyranosyl (1 —> 2)-alpha-l-arabinopyranosyl ester) were new and their structureswere elucidated on the basis of extensive application of NMR techniques and high resolution electrospray mass spectrometry together with acid hydrolysis product analysis. As part of our investigations on the chemical profile and pharmacological activityof the roots of C alba, we report the results of the evaluation of the activity of the saponin fractions against in vitro lipopolysaccharide-induced inflammation. The results found, strongly support the fractions I, III and IV as having anti-inflammatory properties.