Article Dans Une Revue Food Chemistry Année : 2018

New flavanol O-glycosides in grape and wine

Résumé

The presence of monomeric and dimeric flavan-3-ol monohexosides was investigated in grapes and wines. Polyphenol extracts were prepared from grape seeds and skins (Syrah, Merlot, and Cabernet-Sauvignon) sampled at three different developmental stages. Different wines (Tannat, Alicante, Syrah, Merlot, and Grenache) were also studied. The different samples obtained were analyzed by UPLC-ESI-IT-MS. Specific molecular ions corresponding to flavan-3-ol hexosides were detected by using targeted molecular ions with specific m/z values: 451 for (epi) catechin hexosides, and 739 for procyanidin dimer hexosides. 4'-O-beta-glucosyl-(+)-catechin and 7-O-beta-glucosyl-(+)-catechin were obtained by using a glucosyl transferase from apple, UGT71A15, and their structures determined by NMR. These glucosylated monomers and the dimers were identified in all analyzed grape seed and several skin extracts at the different stages and in wines made from different varieties.

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Dates et versions

hal-01918062 , version 1 (09-11-2018)

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Marie Zerbib, Jean Paul Mazauric, Emmanuelle Meudec, Christine Le Guerneve, Alexander Lepak, et al.. New flavanol O-glycosides in grape and wine. Food Chemistry, 2018, 266, pp.441-448. ⟨10.1016/j.foodchem.2018.06.019⟩. ⟨hal-01918062⟩
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