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, 31P 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.
Highlights
Industry is increasingly demanding of biobased phenolic compounds, to be used as building blocks for polymer synthesis or valued for their antiradical activity, especially in the field of polymers, materials, and cosmetics
Recovery of different Protobind 1000 (PB1000) fractions and their contrasted reactivity towards [HMIM]Br treatments PB1000 fractionation PB1000 was fractionated at a semi-pilot scale (1 kg dry powder) through a semi-continuous process intended for future industrial development.[8]
The treatment induced both depolymerization and demethylation of lignin, leading fects were obtained with other commercial technical lignins including Kraft lignin, an integrated cascade process combining ionic liquid (IL) treatment and solvent extractions was designed to optimize and the biodegradability is enhanced with the length of the the recovery yield of ethyl acetate (EA)-soluble extracts with side alkyl chain
Summary
Industry is increasingly demanding of biobased phenolic compounds, to be used as building blocks for polymer synthesis or valued for their antiradical activity, especially in the field of polymers, materials, and cosmetics. Phenolics derived from plant biomass are in particular potential alternatives to synthetic commercial antioxidants such as Bisphenol A[1] and tert-. AguiØ-BØghin FARE Laboratory, Fractionnement des AgroRessources et Environnement INRA UniversitØ de Reims Champagne Ardenne 51100 Reims (France). Gosselink Wageningen Food and Biobased Research 6708 WG Wageningen (The Netherlands)
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