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Physicochemical studies of new anthocyano-ellagitannin hybrid pigments: about the origin of the influence of oak C-glycosidic ellagitannins on wine color

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Chassaing, Stefan | Lefeuvre, Dorothée | Jacquet, Rémi | Jourdes, Michael | Ducasse, Laurent | Galland, Stéphanie | Grélard, Axelle | Saucier, Cédric | Teissedre, Pierre Louis | Dangles, Olivier, O. | Quideau, Stéphanie

Edité par CCSD ; Wiley -

International audience. Kinetic and thermodynamic UV/Vis and structural NMR spectroscopic investigations on the anthocyano-ellagitannin hybrid 1-deoxyvescalagin-(18)-oenin revealed that its enhanced color stability relative to that of the red-colored pigment oenin and resulting bathochromism can be rationalized in terms of an intramolecular -stacking between the grape-derived oenin chromophore and the oak-derived vescalagin 4,6-hexahydroxydiphenoyl moiety. The results led us to suggest that this bathochromism-inducing molecular association could be the first ellagitannin-based molecular-level explanation of the red-to-purple color change that takes place during the aging of wine in oak barrels.

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