Reaction of condensed tannins with ammonia

Published on Jan 1, 2013in Industrial Crops and Products5.645
· DOI :10.1016/J.INDCROP.2012.11.024
Flavia Lega Braghiroli15
Estimated H-index: 15
(University of Lorraine),
Vanessa Fierro62
Estimated H-index: 62
(University of Lorraine)
+ 5 AuthorsAlain Celzard68
Estimated H-index: 68
(University of Lorraine)
Sources
Abstract
Abstract 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 13 C 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 NH 2 . 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.
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