title: High-speed countercurrent chromatography as a valuable tool to isolate C-glycosylflavones from Cecropia lyratiloba Miquel.
abstract: A new apigeninglycoside, apigenin 6-C-galactosyl-6"-O-beta-galactopyranoside (1), isoorientin, and a mixture of orientin and isovitexin were isolated from leaves of Cecropia lyratiloba by high-speed countercurrent chromatography using a solvent system containing ethyl acetate, butanol, methanol and water. The structural elucidation of 1 was based on NMR spectroscopy.
authors.affiliation: Núcleo de Pesquisas de Produtos Naturais, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil. emfibra@uol.com.br
authors.forename: R R
authors.initials: RR
authors.lastname: Oliveira
authors.forename: M C C
authors.initials: MC
authors.lastname: Moraes
authors.forename: R O
authors.initials: RO
authors.lastname: Castilho
authors.forename: A P
authors.initials: AP
authors.lastname: Valente
authors.forename: J P P
authors.initials: JP
authors.lastname: Carauta
authors.forename: D
authors.initials: D
authors.lastname: Lopes
authors.forename: M A C
authors.initials: MA
authors.lastname: Kaplan
mesh_terms: D047310:Apigenin; D035702:Cecropia Plant / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D003377:Countercurrent Distribution / Q000379:methods*; D005419:Flavonoids / Q000302:isolation & purification*; D005960:Glucosides / Q000302:isolation & purification*; D047311:Luteolin; D009682:Magnetic Resonance Spectroscopy; D018515:Plant Leaves / Q000737:chemistry
chemical_list: D005419:Flavonoids; D005960:Glucosides; D047310:Apigenin; C057912:homoorientin; C065886:orientin; C049772:isovitexin; D047311:Luteolin