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Author(s): Frederico Nave
Natercia Teixeira
Nuno Mateus
Victor de Freitas
Title: Hemisynthesis and structural characterization of flavanol-(4,8)-vitisins by mass spectrometry
Issue Date: 2010
Abstract: Vitisins constitute the major group of pyranoanthocyanins naturally occurring in red wines. Regarding their chemical structure, only carboxypyranoanthocyanins have been detected and quantified in red wines, but no vitisin with substitutions in the carbons of the A ring has been identified. However, considering the chemical reactions that take place in red wine, the existence of flavan-3-ol-(4,6/8)-vitisins is expected. This paper reports for the first time the structural identification of catechin-vitisin A and catechin-vitisin B based on their mass data and fragmentation patterns. This work also provides some chromatographic and visible spectroscopic features of these pigments and documents the existence of both in red table wines. Moreover, it is also proposed that Cat-Vit A pigments arise from the cycloaddition of pyruvic acid to an anthocyanin moiety of a flavanol-anthocyanin adduct rather than by direct nucleophilic attack of a vitisin A on the carbocation C(4) of catechin. Copyright (C) 2010 John Wiley & Sons, Ltd.
Subject: Química
Chemical sciences
Scientific areas: Ciências exactas e naturais::Química
Natural sciences::Chemical sciences
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FCUP - Artigo em Revista Científica Internacional

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