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Journal Articles ChemSusChem Year : 2019

Enhancing the antioxidant activity of technical lignins by combining solvent fractionation and ionic-liquid treatment

Abstract

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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hal-02620659 , version 1 (25-05-2020)

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Amel Majira, Blandine Godon, Laurence Foulon, Jacinta C. van Der Putten, Laurent Cezard, et al.. Enhancing the antioxidant activity of technical lignins by combining solvent fractionation and ionic-liquid treatment. ChemSusChem, 2019, 12 (21), pp.4799-4809. ⟨10.1002/cssc.201901916⟩. ⟨hal-02620659⟩
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