title: One new galloyl glycoside from fresh leaves of Psidium guajava L.
abstract: To investigate the chemical constituents of Psidium Guajava L, the EtOH/H2O extract of the fresh leaves was subjected to various chromatography. Five constituents with galloyl moiety were isolated and elucidated as 1-O-(1, 2-propanediol)-6-O-galloyl-beta-D-glucopyranoside (1), gallic acid (2), ellagic acid (3), ellagic acid-4-O-beta-D-glucopyranoside (4) and quercetin-3-O-(6"-galloyl) beta-D-galactopyranoside (5) by spectroscopic methods, including 2D NMR and HR-ESI-MS spectrometry as well as by comparison with published data. Compounds 4 and 5 were obtained from P. guajava for the first time, and compound 1 is a new polyhydroxyl compound.
authors.affiliation: Institute of Chinese Materia Medica of Shanghai University of Traditional Chinese Medicine, The MOE Key Laboratory for Standardization of Chinese Medicines and SATCM, Key Laboratory for New Resources and Quality Evaluation of Chinese Medicines, The Shanghai Key Laboratory for Compound Chinese Medicines, Shanghai 201203, China.
authors.forename: Ji-cheng
authors.initials: JC
authors.lastname: Shu
authors.forename: Gui-xin
authors.initials: GX
authors.lastname: Chou
authors.forename: Zheng-tao
authors.initials: ZT
authors.lastname: Wang
mesh_terms: D004365:Drugs, Chinese Herbal / Q000737:chemistry; D004610:Ellagic Acid / Q000031:analogs & derivatives / Q000737:chemistry / Q000302:isolation & purification; D005697:Galactosides / Q000737:chemistry / Q000302:isolation & purification; D005707:Gallic Acid / Q000031:analogs & derivatives* / Q000737:chemistry / Q000302:isolation & purification; D005960:Glucosides / Q000737:chemistry* / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D018515:Plant Leaves / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D031647:Psidium / Q000737:chemistry*; D011794:Quercetin / Q000031:analogs & derivatives / Q000737:chemistry / Q000302:isolation & purification; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: C571335:1-O-(1,2-propanediol)-6-O-galloyl-beta-D-glucopyranoside; D004365:Drugs, Chinese Herbal; D005697:Galactosides; D005960:Glucosides; C571336:ellagic acid-4-O-beta-D-glucopyranoside; C571334:quercetin-3-O-(6''-galloyl) beta-D-galactopyranoside; D004610:Ellagic Acid; D005707:Gallic Acid; D011794:Quercetin