Identification of new oxidation markers of grape-condensed tannins by UPLC-MS analysis after chemical depolymerization

Laetitia Mouls (1, 2) , Helene Fulcrand-Hoh (1)

1 SPO - Sciences Pour l'Oenologie
2 Montpellier SupAgro - Institut national d’études supérieures agronomiques de Montpellier

Model solutions of oxidized monomer/dimer mixtures of flavan-3-ol (EC/B2, EGC/B2, ECG/B2, EGCG/B2) were studied after chemical depolymerization by UPLC-MS. New oxidation markers of condensed tannins were identified. This analytical method was applied to a wine sample and most of these oxidized markers were detected. This method will permit following the oxidation state of tannins during the winemaking process and storage in order to improve the quality of the products.

Mots clés: Oxidation marker; Autoxidation; ULPC-MS; tannin; oxidation; depolymerization

Mots clés: tanin; oxydation; dépolymérisation; grappe; oenologie

Domaines: Sciences agricoles

Laetitia Mouls, Helene Fulcrand-Hoh. Identification of new oxidation markers of grape-condensed tannins by UPLC-MS analysis after chemical depolymerization. Tetrahedron, 2015, 71 (20), pp.3012-3019. ⟨10.1016/j.tet.2015.01.038⟩. ⟨hal-01506391⟩