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

Abstract

We report that 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. In conclusio, 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.

Authors:
 [1];  [2];  [2];  [2]; ORCiD logo [3];  [2];  [2]; ORCiD logo [4]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Univ. of California, Riverside, CA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23); USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1489560
Grant/Contract Number:  
AC05-00OR22725; EE0007006
Resource Type:
Accepted Manuscript
Journal Name:
Bioresource Technology
Additional Journal Information:
Journal Volume: 272; Journal Issue: C; Journal ID: ISSN 0960-8524
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Lignin valorization; Co-solvent enhanced lignocellulosic fractionation; Sequential precipitation; Molecular weight distribution

Citation Formats

Meng, Xianzhi, Parikh, Aakash, Seemala, Bhogeswararao, Kumar, Rajeev, Pu, Yunqiao Joseph, Wyman, Charles E., Cai, Charles M., and Ragauskas, Arthur J. Characterization of fractional cuts of co-solvent enhanced lignocellulosic fractionation lignin isolated by sequential precipitation. United States: N. p., 2018. Web. doi:10.1016/j.biortech.2018.09.130.
Meng, Xianzhi, Parikh, Aakash, Seemala, Bhogeswararao, Kumar, Rajeev, Pu, Yunqiao Joseph, Wyman, Charles E., Cai, Charles M., & Ragauskas, Arthur J. Characterization of fractional cuts of co-solvent enhanced lignocellulosic fractionation lignin isolated by sequential precipitation. United States. doi:10.1016/j.biortech.2018.09.130.
Meng, Xianzhi, Parikh, Aakash, Seemala, Bhogeswararao, Kumar, Rajeev, Pu, Yunqiao Joseph, Wyman, Charles E., Cai, Charles M., and Ragauskas, Arthur J. Thu . "Characterization of fractional cuts of co-solvent enhanced lignocellulosic fractionation lignin isolated by sequential precipitation". United States. doi:10.1016/j.biortech.2018.09.130. https://www.osti.gov/servlets/purl/1489560.
@article{osti_1489560,
title = {Characterization of fractional cuts of co-solvent enhanced lignocellulosic fractionation lignin isolated by sequential precipitation},
author = {Meng, Xianzhi and Parikh, Aakash and Seemala, Bhogeswararao and Kumar, Rajeev and Pu, Yunqiao Joseph and Wyman, Charles E. and Cai, Charles M. and Ragauskas, Arthur J.},
abstractNote = {We report that 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. In conclusio, 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.},
doi = {10.1016/j.biortech.2018.09.130},
journal = {Bioresource Technology},
number = C,
volume = 272,
place = {United States},
year = {2018},
month = {9}
}

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