[Chemical constituents of the non-alkaloid fraction of Uncaria macrophylla].

OBJECTIVE: To analyze the chemical constituents of the non-alkaloid fraction of Uncaria macrophylla. METHODS: The constituents were separated and purified by silica gel chromatography and recrystalization, and their structures were identified by infrared, mass and nuclear magnetic resonance spectrometry. RESULTS: Six compounds were isolated from the non-alkaloid fraction of Uncaria macrophylla, whose structures were identified as beta-sitosterol, beta-daucosterol, ursolic acid, alpha-amyrin acetate, 3beta, 6beta, 23-trihydroxyurs-12-en-28-oic acid, 3beta-hydroxyurs-12-en-27, and 3beta-hydroxyurs-12-en-27, 28-dioic acid, respectively. CONCLUSIONS: Ursolic acid is the main component in the non-alkaloid fraction of Uncaria macrophylla. Alpha-amyrin acetate and 3beta-hydroxyurs-12-en-27, 28-dioic acid are isolated and characterized for the first time from this plant.