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Title: Isolation, Characterization, and Depolymerization of L-Cysteine Substituted Eucalyptus Lignin

Journal Article · · Global Challenges
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  1. South China Univ. of Technology (SCUT), Guangzhou (China)
  2. South China Univ. of Technology (SCUT), Guangzhou (China); Univ. of Wisconsin, Madison, WI (United States)

Lignin condensation reactions are hard to avoid or control during separation, which is a deterrent to lignin isolation and post-conversation, especially for the full utilization of lignocelluloses. Selective protection of β-aryl ether linkages in the isolation process is crucial to lignin valorization. Herein, a two-step acid/alkali separation method assisted with l-cysteine for eucalyptus lignin separation is developed, and the isolated L-cysteine lignins (LCLs) are comprehensively characterized by 2D NMR, 31P NMR, thioacidolysis, etc. Compared to the two-step control treatment, a much higher β-O-4 content is preserved without reducing the separation efficiency assisted by L-cysteine, which is also significantly higher than alkali lignin and kraft lignin. The results of hydrogenolysis show that LCLs generate a much higher monomer yield than that of control sample. Structural analysis of LCLs suggests that lignin condensation reaction, to some extent, is suppressed by adding L-cysteine during the two-step acid/alkali separation. Further, mechanistic studies using dimeric model compound reveals that L-cysteine may be the α-carbon protective agent in the two-step separation. The role of L-cysteine in the two-step lignin isolation method provides novel insights to the selective fractionation of lignin from biomass, especially for the full valorization of lignocellulosic biomass.

Research Organization:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0018409
OSTI ID:
1904385
Journal Information:
Global Challenges, Vol. 6, Issue 4; ISSN 2056-6646
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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