title: Flavanol derivatives from Rhizophora stylosa and their DPPH radical scavenging activity.
abstract: A new acetylated flavanol, 3,7-O-diacetyl (-)-epicatechin (3), and seven known flavanol derivatives, (-)-epicatechin (1), 3-O-acetyl (-)-epicatechin (2), 3,3',4',5,7-O-pentaacetyl (-)-epicatechin (4), (+)-afzelechin (5), (+)-catechin (6), cinchonain Ib (7), and proanthocyanidin B2 (8), were isolated from the stems and twigs of the mangrove plant Rhizophora stylosa and identified. The crude extract, the different fractions and all of the purified compounds were evaluated for DPPH radical scavenging activity.
authors.affiliation: Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Nanhai Road 7, Qingdao, 266071, PR China.
authors.forename: Dong-Li
authors.initials: DL
authors.lastname: Li
authors.forename: Xiao-Ming
authors.initials: XM
authors.lastname: Li
authors.forename: Ze-Yu
authors.initials: ZY
authors.lastname: Peng
authors.forename: Bin-Gui
authors.initials: BG
authors.lastname: Wang
mesh_terms: D001713:Biphenyl Compounds / Q000737:chemistry*; D044948:Flavonols / Q000302:isolation & purification* / Q000494:pharmacology*; D016166:Free Radical Scavengers / Q000302:isolation & purification* / Q000494:pharmacology*; D006834:Hydrazines / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D010851:Picrates; D043982:Rhizophoraceae / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization; D013055:Spectrophotometry, Infrared
chemical_list: D001713:Biphenyl Compounds; D044948:Flavonols; D016166:Free Radical Scavengers; D006834:Hydrazines; D010851:Picrates; C004931:1,1-diphenyl-2-picrylhydrazyl