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Condensed Tannins from Mangrove Species Kandelia candel and Rhizophora mangle and Their Antioxidant Activity
Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, School of Life Sciences, Xiamen University, Xiamen 361005, China
Key and Open Lab. on Forest Chemical Engineering SFA, Institute of Chemical Industry of Forest Products, CAF; Nanjing 210042, China
* Author to whom correspondence should be addressed.
Received: 12 December 2009; in revised form: 12 January 2010 / Accepted: 17 January 2010 / Published: 20 January 2010
Abstract: The structures of condensed tannins isolated from two mangrove species, Kandelia candel and Rhizophora mangle, were characterized by 13C nuclear magnetic resonance (NMR) spectroscopy and matrix assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) analyses. Results demonstrate that large heterogeneity occurs in degree of polymerization, pattern of hydroxylation, and substitution with monosaccharides in the structures of the condensed tannins. Condensed tannin oligomers from K. candel and R. mangle were shown to be heterogeneous mixtures consisting of procyanidin and prodelphinidin structural units with the former dominating. The MALDI-TOF mass spectra contained masses corresponding to a distinct oligomeric series of glycosylated heteropolyﬂavan units. In addition, condensed tannins from two mangrove plants were screened for their potential antioxidant activities using 1,1-diphenyl-2-picrylhydrazyl (DPPH) and ferric reducing antioxidant power (FRAP) model systems.
Keywords: mangrove; condensed tannins; free radical scavenging activity; reducing power
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MDPI and ACS Style
Zhang, L.-L.; Lin, Y.-M.; Zhou, H.-C.; Wei, S.-D.; Chen, J.-H. Condensed Tannins from Mangrove Species Kandelia candel and Rhizophora mangle and Their Antioxidant Activity. Molecules 2010, 15, 420-431.
Zhang L-L, Lin Y-M, Zhou H-C, Wei S-D, Chen J-H. Condensed Tannins from Mangrove Species Kandelia candel and Rhizophora mangle and Their Antioxidant Activity. Molecules. 2010; 15(1):420-431.
Zhang, Liang-Liang; Lin, Yi-Ming; Zhou, Hai-Chao; Wei, Shu-Dong; Chen, Jia-Hong. 2010. "Condensed Tannins from Mangrove Species Kandelia candel and Rhizophora mangle and Their Antioxidant Activity." Molecules 15, no. 1: 420-431.