title: Biflavonoids from the unripe fruits of Clusia paralicola and their antioxidant activity.
abstract: Investigation of the green fruits of Clusia paralicola (Clusiaceae) led to the isolation and characterization of two 3,8"-biflavonoids, 2R, 3S, 2"R, 3"R-GB1-7"-O-beta-glucoside (1) and 2R, 3S, 2"R, 3,8"-binaringenin-7"-O-beta-glucoside (2), together with four known compounds: beta-sitosterol, stigmasterol, beta-amyrin, and epicatechin. The structures were established from the IR, LC-ESI-MS and NMR spectral data, including 2D-NMR experiments. The absolute configurations of 1 and 2 were determined by CD spectra. The total extract and the biflavonoids demonstrated significant antioxidant activity in DPPH, ABTS, and betacarotene/linoleic acid tests.
authors: Departamento de Ciencias Moleculares, Universidade Federal Rural de Pernambuco, Recife, Pernambuco, CEP 52171-900, Brazil.
authors: Rafaela Ferreira
authors: RF
authors: Oliveira
authors: Celso Amorim
authors: CA
authors: Camara
authors: Maria Fátima
authors: MF
authors: de Agra
authors: Tania Maria Sarmento
authors: TM
authors: Silva
mesh_terms: D000975:Antioxidants / Q000737:chemistry*; D052160:Benzothiazoles / Q000737:chemistry; D001713:Biphenyl Compounds / Q000737:chemistry; D002942:Circular Dichroism; D031251:Clusia / Q000737:chemistry*; D044950:Flavanones / Q000737:chemistry*; D005419:Flavonoids / Q000737:chemistry* / Q000302:isolation & purification; D005638:Fruit / Q000737:chemistry*; D019787:Linoleic Acid / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D010851:Picrates / Q000737:chemistry; D021241:Spectrometry, Mass, Electrospray Ionization; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D013451:Sulfonic Acids / Q000737:chemistry; D019207:beta Carotene / Q000737:chemistry
chemical_list: C578810:2R,3S,2''R,3,8''-binaringenin-7''-O-beta-glucoside; D000975:Antioxidants; D052160:Benzothiazoles; D001713:Biphenyl Compounds; D044950:Flavanones; D005419:Flavonoids; D010851:Picrates; D013451:Sulfonic Acids; D019207:beta Carotene; C002502:2,2'-azino-di-(3-ethylbenzothiazoline)-6-sulfonic acid; D019787:Linoleic Acid; C004931:1,1-diphenyl-2-picrylhydrazyl