Journal
INDUSTRIAL CROPS AND PRODUCTS
Volume 95, Issue -, Pages 621-631Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.indcrop.2016.11.031
Keywords
Catechin- triethyl phosphate reactions; Flavonoid tannins- triethyl phosphate reactions; Resorcinol- triethyl phosphate reactions; Condensation and cross-linking; MALDI-ToF; CP-MAS C-13 NMR; P-31 NMR; FTIR; TGA
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Funding
- French National Research Agency (ANR) as part of the Laboratory of Excellence (Labex) ARBRE
- Deanship of Scientific Research (DSR), King Abdulaziz University Jeddah [7-130-36-HiCi]
- DSR
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Reaction of condensation and cross-linking of catechin monomer as a model of condensed (flavonoid) tannin extracts and of mimosa tannin itself, as well as of resorcinol with triethyl phosphate (TEP) have been investigated. FTIR, solid state CP-MAS C-13 NMR, P-31 NMR and MALDI-ToF spectroscopy studies revealed that reaction occurs mainly on the C3 of the flavonoid heterocycle ring and on the aromatic C4' and C5' carbons of the flavonoids B-ring, while TEP does not appear to react on the A-ring. A difference in the relative proportions of these two reaction sites for tannin and catechin has been noticed. The reactions appear to be dependent on the temperature. According to the thermogravimetric analysis, materials obtained from the reaction of tannin with TEP showed high thermal stability. (C) 2016 Elsevier B.V. All rights reserved.
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