RESUMEN
Objective: To study the chemical constituents from the branches of Malus pumila. Methods: Compounds were isolated and purified on many kinds of column chromatography, such as silica gel, Sephadex LH-20, ODS, and PHPLC. The structures of the obtained compounds were identified by their physical properties and spectroscopic data. Results: Eleven compounds were separated and purified from the ethyl acetate extract from the branches of M. pumila. They were identified to be phloretin (1), erlodictyol (2), 8-methoxyl-kaempferol-7-O-rhamnoside (3), quercetin (4), 6-methoxy-quercetin (5), protocatechuic acid methyl ester (6), quercetin-3-O-arabinofuranosidase (7), phlorizin (8), aureusidin-6-O-β-D-glucoside (9), quercetin-3-O-D-xylose (10), and 3,4-dihydroxybenzoic acid ethyl ester (11). Conclusion: Compounds 2 and 9 are firstly reported from the plants of Rosaceae. Compound 11 is isolated from this genus and compound 3 is obtained from this plant for the first time.