Journal of Zhejiang University SCIENCE B
ISSN 1673-1581(Print), 1862-1783(Online), Monthly

2008   Vol. 9   No. 5   p. 407~415

Tannins from Canarium album with potent antioxidant activity

Liang-liang ZHANG¹, Yi-ming LIN^†‡1,2

(¹Department of Biology, School of Life Sciences, Xiamen University, Xiamen 361005, China)
(²Research Centre for Wetlands and Ecological Engineering, Xiamen University, Xiamen 361005, China)
^‡ Corresponding Author
^†E-mail: linym@xmu.edu.cn
Received Jan. 1, 2008; revision accepted Mar. 18, 2008

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.

Key words: Canarium album, Tannins, Antioxidant capacity, Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS)
doi:10.1631/jzus.B0820002             CLC number: Q946.84

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