Characterization of fractional cuts of co-solvent enhanced lignocellulosic fractionation lignin isolated by sequential precipitation

Xianzhi Meng; Aakash Parikh; Bhogeswararao Seemala; Rajeev Kumar; Yunqiao Pu; Charles E. Wyman; Charles M. Cai; Arthur J. Ragauskas

doi:10.1016/j.biortech.2018.09.130

Characterization of fractional cuts of co-solvent enhanced lignocellulosic fractionation lignin isolated by sequential precipitation

Xianzhi Meng, Aakash Parikh, Bhogeswararao Seemala, Rajeev Kumar, Yunqiao Pu, Charles E. Wyman, Charles M. Cai, Arthur J. Ragauskas

Biomaterials and Biomass Characterizatio

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76 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	202-208
Number of pages	7
Journal	Bioresource Technology
Volume	272
DOIs	https://doi.org/10.1016/j.biortech.2018.09.130
State	Published - Jan 2019

Funding

The authors acknowledge funding support from Bioenergy Technologies Office ( BETO ) in the Office of Energy Efficiency and Renewable Energy (EERE) under Award No. DE-EE0007006 with U.S. Department of Energy (DOE). The poplar supplied in this study was supported by the Center for Bioenergy Innovation (CBI). CBI is a U.S. DOE Bioenergy Research Center supported by the Office of Biological and Environmental Research in the DOE Office of Science. The publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, worldwide license to reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. DOE will provide public access to these results of federally sponsored research in accord with the DOE Public Access Plan (https://www.energy.gov/downloads/doe-public-access-plan). The views and opinions of the authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. The authors acknowledge funding support from Bioenergy Technologies Office (BETO) in the Office of Energy Efficiency and Renewable Energy (EERE) under Award No. DE-EE0007006 with U.S. Department of Energy (DOE). The poplar supplied in this study was supported by the Center for Bioenergy Innovation (CBI). CBI is a U.S. DOE Bioenergy Research Center supported by the Office of Biological and Environmental Research in the DOE Office of Science. The publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, worldwide license to reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. DOE will provide public access to these results of federally sponsored research in accord with the DOE Public Access Plan (https://www.energy.gov/downloads/doe-public-access-plan). The views and opinions of the authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights.

Funders	Funder number
DOE Office of Science
Office of Biological and Environmental Research
U.S. Department of Energy
Office of Energy Efficiency and Renewable Energy
Bioenergy Technologies Office	DE-EE0007006
Center for Bioenergy Innovation

Keywords

Co-solvent enhanced lignocellulosic fractionation
Lignin valorization
Molecular weight distribution
Sequential precipitation

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10.1016/j.biortech.2018.09.130

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title = "Characterization of fractional cuts of co-solvent enhanced lignocellulosic fractionation lignin isolated by sequential precipitation",

abstract = "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.",

keywords = "Co-solvent enhanced lignocellulosic fractionation, Lignin valorization, Molecular weight distribution, Sequential precipitation",

author = "Xianzhi Meng and Aakash Parikh and Bhogeswararao Seemala and Rajeev Kumar and Yunqiao Pu and Wyman, {Charles E.} and Cai, {Charles M.} and Ragauskas, {Arthur J.}",

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AU - Meng, Xianzhi

AU - Parikh, Aakash

AU - Seemala, Bhogeswararao

AU - Kumar, Rajeev

AU - Pu, Yunqiao

AU - Wyman, Charles E.

AU - Cai, Charles M.

AU - Ragauskas, Arthur J.

PY - 2019/1

Y1 - 2019/1

N2 - 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.

AB - 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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Characterization of fractional cuts of co-solvent enhanced lignocellulosic fractionation lignin isolated by sequential precipitation

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Keywords

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