Hemisynthesis and structural characterization of flavanol-(4,8)-vitisins by mass spectrometry

• Type: Article in International Scientific Journal
• Date: 2010

Authors

Frederico Nave (Author) Other; Natercia Teixeira (Author) Other; Nuno Mateus (Author) FCUP; Victor de Freitas (Author) FCUP

Journal

Title: Rapid Communications in Mass Spectrometry

Vol. 24 No. 14

Pages: 1964-1970

ISSN: 0951-4198

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 9 Citations

Scopus - 9 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-003-5G8

DOI: 10.1002/rcm.4599

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7