Lyophilized aqueous extracts obtained from Agave americana L. (Agavace
ae) collected in the north of Sardinia were characterized with regard
to their steroidal sapogenin content. Extracts of A. americana and gen
ins isolated from them were evaluated for anti-inflammatory properties
by testing their effects on carrageenin-induced edema. The effect of
orally administered genins on gastric mucous membranes was also assess
ed. Lyophilized extracts administered by the intraperitoneal route at
doses equivalent to 200 and 300 mg/kg of fresh plant starting material
, showed good anti-inflammatory activity. Doses of genins (total stero
idal sapogenins, hecogenin and tigogenin) equivalent to the amount in
the lyophilized extracts produced an antiedeniatous effect which was m
uch stronger and more efficacious than that obtained with an i.p. admi
nistration of 5 mg/kg of indomethacin or dexamethasone 21-phosphate at
a dose equivalent to the molar content of hecogenin administered. At
the doses used to evaluate the anti-inflammatory activity, the genins
did not have any harmful effect on the gastric mucous membranes. Lesio
ns occurred when significantly higher doses of hecogenin were given, b
ut gastric damage was still less than that caused by the drugs used fo
r comparative purposes.