Enhancing the antioxidant activity of technical lignins by combining solvent fractionation and ionic-liquid treatment
2019
Majira, Amel | Godon, Blandine | Foulon, Laurence | van Der Putten, Jacinta C. | Cezard, Laurent | Thierry, Marina | Pion, Florian | Bado-Nilles, Anne | Pandard, Pascal | Jayabalan, Thangavelu | Aguié-Béghin, Véronique | Ducrot, Paul Henri | Lapierre, Catherine | Marlair, Guy | Gosselink, Richard J. A. | Baumberger, Stéphanie | Cottyn, Betty | Institut Jean-Pierre Bourgin (IJPB) ; Institut National de la Recherche Agronomique (INRA)-AgroParisTech | Université Paris Saclay (COmUE) | Fractionnement des AgroRessources et Environnement (FARE) ; Université de Reims Champagne-Ardenne (URCA)-Institut National de la Recherche Agronomique (INRA) | Wageningen University and Research [Wageningen] (WUR) | Institut National de l'Environnement Industriel et des Risques (INERIS) | ANR-10-LABX-552 0040SPS
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Show more [+] Less [-]English. A grass soda technical lignin (PB1000) underwent a process combining solvent fractionation and treatment with an ionic liquid (IL), and a comprehensive investigation of the structural modifications was performed by using high-performance size-exclusion chromatography, P-31 NMR spectroscopy, thioacidolysis, and GC-MS. Three fractions with distinct reactivity were recovered from successive ethyl acetate (EA), butanone, and methanol extractions. In parallel, a fraction deprived of EA extractives was obtained. The samples were treated with methyl imidazolium bromide ([HMIM]Br) by using either conventional heating or microwave irradiation. The treatment allowed us to solubilize 28 % of the EA-insoluble fraction and yielded additional free phenols in all the fractions, as a consequence of depolymerization and demethylation. The gain of the combined process in terms of antioxidant properties was demonstrated through 2,2-diphenyl-1-picrylhydrazyl (DPPH.) radical-scavenging tests. Integrating further IL safety-related data and environmental considerations, this study paves the way for the sustainable production of phenolic oligomers competing with commercial antioxidants.
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