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Characterization and antioxidative properties of condensed tannins from the mangrove plant Aegiceras corniculatum
Author(s) -
Wei ShuDong,
Lin YiMing,
Liao MengMeng,
Zhou HaiChao,
Li YuanYue
Publication year - 2011
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.35258
Subject(s) - chemistry , butylated hydroxyanisole , dpph , proanthocyanidin , bark (sound) , catechin , epicatechin gallate , organic chemistry , nuclear chemistry , antioxidant , polyphenol , biology , ecology
Freeze‐dried leaf, stem bark, and root bark powders of Aegiceras corniculatum were extracted with three different types of polar solvents: methanol, ethyl acetate, and water. The methanol extracts had the highest concentrations in total phenolics and extractable condensed tannins, followed by water and ethyl acetate extracts. Analysis by matrix‐assisted laser desorption/ionization time‐of‐flight mass spectrometry (MALDI‐TOF MS) suggested that condensed tannins from leaf, stem bark, and root bark contained prodelphinidins and procyanidins, with the predominance of prodelphinidins and high level of galloylation. Acid‐catalyzed degradation in the presence of benzyl mercaptan indicated that gallocatechin, epigallocatechin, epigallocatechin‐3‐ O ‐gallate, and epicatechin‐3‐ O ‐gallate occurred as the terminal units and (epi)gallocatechin, (epi)gallocatechin‐3‐ O ‐gallate, (epi)catechin, and (epi)catechin‐3‐ O ‐gallate occurred as the extension units. The mean degrees of polymerization (mDP) of condensed tannins from leaf, stem bark, and root bark were 13.5, 7.4, and 12.3, respectively. The condensed tannins from leaf and stem bark exhibited a higher DPPH radical scavenging activity and ferric reducing/antioxidant power compared to that of synthetic antioxidant butylated hydroxyanisole (BHA). © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012