Reaction of condensed tannins with ammonia - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Industrial Crops and Products Année : 2013

Reaction of condensed tannins with ammonia

Résumé

Reaction of condensed (flavonoid) mimosa tannin extracts with concentrated aqueous ammonia has been investigated. For that purpose, catechin was also used as a flavonoid model compound and treated in similar conditions. Solid state CP-MAS C-13 NMR and MALDI-ToF spectroscopy studies revealed that, unlike what was recently theorised, amination is not always regioselective and leading to the conversion of one single-OH group in C4' into-NH2. In the present study, new reactions have been evidenced, clearly leading to multiamination of several phenolic hydroxyl groups, heterocycle opening, and oligomerisation and cross-linking through the formation of-N= bridges between flavonoid units.
Fichier non déposé

Dates et versions

hal-01296299 , version 1 (31-03-2016)

Identifiants

Citer

F. Braghiroli, Vanessa Fierro, Antonio Pizzi, K. Rode, W. Radke, et al.. Reaction of condensed tannins with ammonia. Industrial Crops and Products, 2013, 44, pp.330-335. ⟨10.1016/j.indcrop.2012.11.024⟩. ⟨hal-01296299⟩
122 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More