Flavanol derivatives from Rhizophora stylosa and their DPPH radical scavenging activity.
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.
Li
Dong-Li
DL
Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Nanhai Road 7, Qingdao, 266071, PR China.
Li
Xiao-Ming
XM
Peng
Ze-Yu
ZY
Wang
Bin-Gui
BG
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
D001713:Biphenyl Compounds; D044948:Flavonols; D016166:Free Radical Scavengers; D006834:Hydrazines; D010851:Picrates; C004931:1,1-diphenyl-2-picrylhydrazyl