title: [Triterpenoid constituents in fruits of Psidum guajava].
abstract: The chemical constituents from the fruit of Psidium guajava were investigated. Nine triterpenoids, ursolic acid (1), 1beta, 3beta-dihydroxyurs-12-en-28-oic acid (2), 2alpha,3beta-dihydroxyurs-12-en-28-oic acid (3), 3beta,19alpha-dihydroxyurs-12en-28-oic acid (4), 19a-hydroxylurs-12-en-28-oic acid-3-O-alpha-L-arabinopyranoside (5), 3beta, 23-dihydroxy urs-12-en-28-oic acid (6), 3beta, 19alpha, 23beta-tri-hydroxylurs-12-en-28-oic acid (7), 2alpha, 3beta,19alpha, 23beta-tetrahydroxyurs-12-en-28-oic acid (8), 3alpha,19alpha,23,24-tetrahydroxyurs -12-en-28-oic acid (9) were isolated by means of chromatography, and their structures were elucidated on the basis of MS, H NMR, 13C-NMR spectra. Compounds 2, 5-9 were isolated from this plant for the first time.
authors.affiliation: Key Laboratory of Standardization of Chinese Medicines, Shanghai R&D Center for standardization of Chinese Medicines, Ministry of Education, Institute of Chinese Materia Medica of Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China.
authors.forename: Jicheng
authors.initials: J
authors.lastname: Shu
authors.forename: Guixin
authors.initials: G
authors.lastname: Chou
authors.forename: Zhengtao
authors.initials: Z
authors.lastname: Wang
mesh_terms: D005638:Fruit / Q000737:chemistry*; D010936:Plant Extracts / Q000032:analysis*; D031647:Psidium / Q000737:chemistry*; D014315:Triterpenes / Q000032:analysis*
chemical_list: D010936:Plant Extracts; D014315:Triterpenes