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Chemical constituents of the leaves of rabbiteye blueberry (Vaccinium ashei) and characterisation of polymeric proanthocyanidins containing phenylpropanoid units and A-type linkages


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Title: Chemical constituents of the leaves of rabbiteye blueberry (Vaccinium ashei) and characterisation of polymeric proanthocyanidins containing phenylpropanoid units and A-type linkages
Authors: Matsuo, Yosuke / Fujita, Yusuke / Ohnishi, Sachiko / Tanaka, Takashi / Hirabaru, Hideaki / Kai, Takanori / Sakaida, Hiroshi / Nishizono, Shoko / Kouno, Isao
Issue Date: 15-Aug-2010
Publisher: Elsevier Ltd
Citation: Food Chemistry, 121(4), pp.1073-1079; 2010
Abstract: Chemical constituents of the leaves of rabbiteye blueberry (Vaccinium ashei READE) were investigated in detail. The major phenolic components were caffeoyl quinic acids, flavonol glycosides, flavan-3-ols and proanthocyanidins. Catechins and proanthocyanidins having additional phenylpropanoid units, such as cinchonains, kandelins and mururins, characterised the polyphenols of this plant. Among them, vaccinin A, an isomer of mururin A, was found to be a new compound, and the structure was characterised by spectroscopic methods. The most abundant polyphenols (11.3% of freeze-dried leaves) were oligomeric proanthocyanidins. Thiol degradation with mercaptoethanol indicated that the polymer was constituted of (+)-catechin and (-)-epicatechin as the terminal units and (-)-epicatechin, procyanidin A-2, and cinchonains Ia and Ib as the extension units. Mass spectral analysis suggested the presence of at least dodecamers with A-type linkages and phenylpropanoid moieties.
Keywords: Blueberry / Catechin / Cinchonain / Polyphenol / Proanthocyanidin / Vaccinium ashei
URI: http://hdl.handle.net/10069/23061
ISSN: 03088146
DOI: 10.1016/j.foodchem.2010.01.052
Rights: © 2010 Elsevier Ltd. All rights reserved.
Type: Journal Article
Text Version: author
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/23061

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