title: [Study on aqueous chemical constituents from the flower buds of Eugenia caryophylla].
abstract: OBJECTIVE
  To study the aqueous chemical constituents of the flower buds of Eugenia caryophylla.
  
  
  METHODS
  The compounds were isolated by HP-20 resin column chromatography, RP-C18 column chromatography, preparative RP-C18 thin-layer chromatography, preparative RP-C18 high performance liquid chromatography, and their structures were established by NMR and MS evidences.
  
  
  RESULTS
  Five compounds were separated from the water extracts. Their structures were identified as quercetin-3-O-glucuronide (1), quercetin-3-O-glucuronide 6"-methyl ester (2), quercetin-3-O-glucopy-ranoside (3) , eugenyl-beta-rutinoside (4) and myricetin (5).
  
  
  CONCLUSIONS
  Compounds 1-4 are isolated from the genus for the first time.
authors.affiliation: Center for Health Food Evaluation, State Food and Drug Administration, Beijing 100070, China. liuhynn@hotmail.com
authors.forename: Hong-Yu
authors.initials: HY
authors.lastname: Liu
authors.forename: Shu
authors.initials: S
authors.lastname: Zhu
authors.forename: Katsuko
authors.initials: K
authors.lastname: Komatsu
authors.forename: Shao-Qing
authors.initials: SQ
authors.lastname: Cai
authors.forename: Ya-Hui
authors.initials: YH
authors.lastname: Li
authors.forename: Chao
authors.initials: C
authors.lastname: Yu
authors.forename: Yu
authors.initials: Y
authors.lastname: Jiang
authors.forename: Yi
authors.initials: Y
authors.lastname: Sa
mesh_terms: D002851:Chromatography, High Pressure Liquid; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification; D035264:Flowers / Q000737:chemistry; D005960:Glucosides / Q000737:chemistry / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D010946:Plants, Medicinal / Q000737:chemistry*; D011794:Quercetin / Q000031:analogs & derivatives* / Q000737:chemistry / Q000302:isolation & purification; D027842:Syzygium / Q000737:chemistry*
chemical_list: D005419:Flavonoids; D005960:Glucosides; C525669:quercetin 3-O-(2''-galloyl)glucopyranoside; C443401:quercetin 3-O-glucuronide; C040015:myricetin; D011794:Quercetin