title: Tannins from Canarium album with potent antioxidant activity.
abstract: The contents of total phenolics and extractable condensed tannins in the leaves, twigs and stem bark of Canarium album were determined. The structural heterogeneity of condensed tannins from stem bark was characterized by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) and nuclear magnetic resonance (NMR) analyses. The results show the predominance of signals representative of procyanidins and prodelphinidins. In addition, epicatechin and epigallocatechin polymers with galloylated procyanidin or prodelphinidin were also observed. The tannins were screened for their potential antioxidant activities using 1,1-diphenyl-2-picrylhydrazyl (DPPH) and ferric reducing/antioxidant power (FRAP) model systems. Tannins extracted from leaves, twigs and stem bark all showed a very good DPPH radical scavenging activity and ferric reducing power.
authors.affiliation: Department of Biology, School of Life Sciences, Xiamen University, Xiamen 361005, China.
authors.forename: Liang-liang
authors.initials: LL
authors.lastname: Zhang
authors.forename: Yi-ming
authors.initials: YM
authors.lastname: Lin
mesh_terms: D000975:Antioxidants / Q000032:analysis* / Q000737:chemistry / Q000494:pharmacology; D029403:Burseraceae / Q000737:chemistry*; D016166:Free Radical Scavengers / Q000494:pharmacology; D009682:Magnetic Resonance Spectroscopy; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013634:Tannins / Q000032:analysis* / Q000737:chemistry / Q000494:pharmacology
chemical_list: D000975:Antioxidants; D016166:Free Radical Scavengers; D013634:Tannins