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Enhancing the Antioxidant Activity of Technical Lignins by Combining Solvent Fractionation and Ionic-Liquid Treatment.
- Source :
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ChemSusChem [ChemSusChem] 2019 Nov 08; Vol. 12 (21), pp. 4799-4809. Date of Electronic Publication: 2019 Sep 24. - Publication Year :
- 2019
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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, <superscript>31</superscript> 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 <superscript>.</superscript> ) 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.<br /> (© 2019 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.)
Details
- Language :
- English
- ISSN :
- 1864-564X
- Volume :
- 12
- Issue :
- 21
- Database :
- MEDLINE
- Journal :
- ChemSusChem
- Publication Type :
- Academic Journal
- Accession number :
- 31436856
- Full Text :
- https://doi.org/10.1002/cssc.201901916