Identification of anthocyanin-flavanol pigments in red wines by NMR and mass spectrometry |
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| Authors: | Mateus Nuno Silva Artur M S Santos-Buelga Celestino Rivas-Gonzalo Julian C de Freitas Victor |
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| Institution: | Faculdade de Ciências, Universidade do Porto, Centro de Investiga??o em Química, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal. |
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| Abstract: | Three newly formed Port wine pigments were isolated by Toyopearl HW-40(s) gel chromatography and semipreparative HPLC. Furthermore, the pigments were identified by mass spectrometry (LC/MS) and NMR techniques (1D and 2D). These anthocyanin-derived pigments showed UV-visible spectra different from those of the original grape anthocyanins. These pigments correspond to malvidin 3-glucoside linked through a vinyl bond to either (+)-catechin, (-)-epicatechin, or procyanidin dimer B3 (+)-catechin-(+)-catechin]. NMR data of these pigments are reported for the first time. |
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