title: MALDI-TOF MS analysis of condensed tannins with potent antioxidant activity from the leaf, stem bark and root bark of Acacia confusa.
abstract: The structures of the condensed tannins from leaf, stem bark and root bark of Acacia confusa were characterized by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) analysis, and their antioxidant activities were measured using 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging and ferric reducing/antioxidant power (FRAP) assays. The results showed that the condensed tannins from stem bark and root bark include propelargonidin and procyanidin, and the leaf condensed tannins include propelargonidin, procyanidin and prodelphinidin, all with the procyanidin dominating. The condensed tannins had different polymer chain lengths, varying from trimers to undecamers for leaf and root bark and to dodecamers for stem bark. The condensed tannins extracted from the leaf, stem bark and root bark all showed a very good DPPH radical scavenging activity and ferric reducing power.
authors.affiliation: Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, School of Life Sciences, Xiamen University, Xiamen 361005, China.
authors.forename: Shu-Dong
authors.initials: SD
authors.lastname: Wei
authors.forename: Hai-Chao
authors.initials: HC
authors.lastname: Zhou
authors.forename: Yi-Ming
authors.initials: YM
authors.lastname: Lin
authors.forename: Meng-Meng
authors.initials: MM
authors.lastname: Liao
authors.forename: Wei-Ming
authors.initials: WM
authors.lastname: Chai
mesh_terms: D000045:Acacia / Q000737:chemistry*; D000975:Antioxidants / Q000737:chemistry*; D015394:Molecular Structure; D024301:Plant Bark / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry*; D018517:Plant Roots / Q000737:chemistry*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000379:methods*; D013634:Tannins / Q000737:chemistry*
chemical_list: D000975:Antioxidants; D013634:Tannins