Enhancing the Antioxidant Activity of Technical Lignins by Combining Solvent Fractionation and Ionic‐Liquid Treatment. Issue 21 (24th September 2019)

• Record Type: Journal Article
• Authors: Majira, Amel; Godon, Blandine; Foulon, Laurence; van der Putten, Jacinta C.; Cézard, 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, Stephanie; Cottyn, Betty
• Is Part Of: ChemSusChem. Volume 12:Issue 21(2019)
• Page Start: 4799
• Page End: 4809
• Publication Date: 2019-09-24
• Subjects: antioxidants -- biorefinery -- green chemistry -- ionic liquids -- lignins; Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.201901916
• Languages: English
• ISSNs: 1864-5631

Abstract

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, 31 P 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. Abstract : Technical lignin refinement : A cascade biorefinery process is presented that enables upgrading of technical lignins and sustainable production of phenolic oligomers of interest as substitutes for commercial antioxidants.