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Molecules 2010, 15(8), 5658-5670; doi:10.3390/molecules15085658

Antioxidant Tannins from Stem Bark and Fine Root of Casuarina equisetifolia

1
Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, School of Life Sciences, Xiamen University, Xiamen 361005, China
2
Fujian Academy of Forestry, Fuzhou 350012, China
*
Author to whom correspondence should be addressed.
Received: 21 July 2010 / Revised: 10 August 2010 / Accepted: 13 August 2010 / Published: 16 August 2010
(This article belongs to the Special Issue Tannins)
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Abstract

Structures of condensed tannins from the stem bark and fine root of Casuarina equisetifolia were identified using MALDI-TOF MS and HPLC analyses. The condensed tannins from stem bark and fine root consist predominantly of procyanidin combined with prodelphinidin and propelargonidin, and epicatechin is the main extension unit. The condensed tannins had different polymer chain lengths, varying from trimers to tridecamer for stem bark and to pentadecamer for fine root. The antioxidant activities were measured by two models: 1,1-diphenyl-2- picrylhydrazyl (DPPH) radical scavenging activity and ferric reducing/ antioxidant power  (FRAP). The condensed tannins extracted from C. equisetifolia showed very good DPPH radical scavenging activity and ferric reducing/ antioxidant power, suggesting that these extracts may be considered as new sources of natural antioxidants for food and nutraceutical products.
Keywords: Casuarina equisetifolia; condensed tannins; MALDI-TOF MS; HPLC; antioxidant activity Casuarina equisetifolia; condensed tannins; MALDI-TOF MS; HPLC; antioxidant activity
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Zhang, S.-J.; Lin, Y.-M.; Zhou, H.-C.; Wei, S.-D.; Lin, G.-H.; Ye, G.-F. Antioxidant Tannins from Stem Bark and Fine Root of Casuarina equisetifolia. Molecules 2010, 15, 5658-5670.

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