[Studies on chemical constituents of leaves of Psidium guajava]

Zhongguo Zhong Yao Za Zhi. 2009 Mar; 34(5): 577-9Fu H, Luo Y, Zhang DOBJECTIVE: To study the chemical constituents of the leaves of Psidium guajava. METHOD: The chemical constituents were isolated by column chromatography on silica gel, Sephadex LH-20 and MPLC. Their structures were elucidated on the basis of spectral analysis. RESULT: Nine compounds were isolated from this plant, and the structure of them were identified as ursolic acid (1), 2alpha-hydroxyursolic acid (2), 2alpha-hydroxyoleanolic acid (3), morin-3-O-alpha-L-arabopyranoside (4), quercetin (5), hyperin (6), myricetin-3-O-beta-D-glucoside (7), quercetin-3-O-beta-D-glucuronopyranoside (8), 1-O-galloyl-beta-D-glucose (9). CONCLUSION: Compounds 3, 7-9 were isolated from this plant for the first time.