Journal
BIORESOURCE TECHNOLOGY
Volume 272, Issue -, Pages 202-208Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.09.130
Keywords
Lignin valorization; Co-solvent enhanced lignocellulosic fractionation; Sequential precipitation; Molecular weight distribution
Funding
- Bioenergy Technologies Office (BETO) in the Office of Energy Efficiency and Renewable Energy (EERE)
- U.S. Department of Energy (DOE) [DE-EE0007006]
- Center for Bioenergy Innovation (CBI)
- Office of Biological and Environmental Research in the DOE Office of Science
- DOE Public Access Plan
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Lignin valorization is significantly hindered by the intrinsic heterogeneity of its complex structures and variability of biomass feedstocks. Fractionation of lignin can overcome these challenges by producing functionally distinct lignin cuts that can be further tailored to end products. Herein, lignin was extracted and depolymerized from poplar by the co-solvent enhanced lignocellulosic fractionation method with renewable THF to obtain CELF lignin. Several solvents were screened to separate soluble and insoluble fractions from the parent CELF lignin. The ethanol soluble portion was then fractionated into different molecular weight cuts via sequential precipitation of the lignin by reducing the concentration of THF. The physicochemical structures of different CELF lignin cuts were elucidated by GPC and NMR techniques. These results suggest that CELF lignin cuts with lower molecular weight contain progressively higher phenolic and carboxylic acid OH groups, which can be more suitable as green antioxidants than the parent lignin.
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