title: [Studies on the flavonoids from the flowers of Hylocereus undatus].
abstract: OBJECTIVE
  To study the chemical constituents of the flowers of Hylocereus undatus.
  
  
  METHODS
  The constituents were isolated and purified by various modern chromatographic techniques. The structures of the compounds were elucidated based on their physicochemical properties and spectral analyses.
  
  
  RESULTS
  Thirteen compounds were isolated from the flowers of H. undatus. Their structures were elucidated as kaempferol (1), quercetin (2), isorhamnetin (3), kaempferol 3-O-alpha-L-arabinfuranoside (4), kaempferol 3-O-beta-D-glucopyranoside (5), quercetin 3-O-beta-D-glucopyranoside (6), isorhamnetin 3-O-beta-D-glucopyranoside (7), kaempferol 3-O-beta-D-galactopyranoside (8), quercetin 3-O-beta-D-galactopyranoside (9), kaempferol 3-O-beta-D-rutinoside (10), isorhamnetin 3-O-beta-D-rutinoside (11), kaempferol 3-O-alpha-L-rhamopyranosyl-(1 --> 6)-beta-D-galactopyranoside (12), and isorhamnetin 3-O-alpha-L-rhamopyranosyl-(1 --> 6)-beta-D-galactopyranoside (13).
  
  
  CONCLUSIONS
  All the compounds are isolated from this plant for the first time.
authors.affiliation: Institute of Chinese Medical Sciences, University of Macau, Macao SAR, China. yiyan12345@gmail.com
authors.forename: Yan
authors.initials: Y
authors.lastname: Yi
authors.forename: Xin
authors.initials: X
authors.lastname: Wu
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
authors.forename: Wen-Cai
authors.initials: WC
authors.lastname: Ye
authors.forename: Qing-Wen
authors.initials: QW
authors.lastname: Zhang
mesh_terms: D029421:Cactaceae / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D004187:Disaccharides / Q000737:chemistry / Q000302:isolation & purification; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification*; D035264:Flowers / Q000737:chemistry*; D005960:Glucosides / Q000737:chemistry / Q000302:isolation & purification*; D044949:Kaempferols / Q000737:chemistry / Q000302:isolation & purification*; D015394:Molecular Structure; D009005:Monosaccharides / Q000737:chemistry / Q000302:isolation & purification; D011794:Quercetin / Q000031:analogs & derivatives* / Q000737:chemistry / Q000302:isolation & purification
chemical_list: D004187:Disaccharides; D005419:Flavonoids; D005960:Glucosides; D044949:Kaempferols; D009005:Monosaccharides; C515815:isorhamnetin 3-O-rutinoside; C517440:quercetin-3'-O-beta-D-glucopyranoside; D011794:Quercetin; C110309:quercetin 3-O-glucopyranoside