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Isolation, Characterization, and Depolymerization of l-Cysteine Substituted Eucalyptus Lignin.
Lanlan Shi1, Tanhao Zhang1, Xin Zhou1
1State Key Laboratory of Pulp and Paper Engineering School of Light Industry and Engineering South China University of Technology Guangzhou 510640 China.
Global Challenges (Hoboken, NJ)
|April 18, 2022
Summary
Lignin isolation is improved using a two-step acid/alkali method with l-cysteine, preserving key linkages and increasing monomer yield for biomass valorization.
Area of Science:
- Biomass valorization
- Lignin chemistry
- Green chemistry
Background:
- Lignin condensation reactions hinder efficient isolation and utilization of lignocelluloses.
- Selective protection of β-aryl ether linkages is critical for lignin valorization.
Purpose of the Study:
- To develop a novel method for isolating eucalyptus lignin with enhanced structural integrity.
- To investigate the role of l-cysteine in preventing lignin condensation during separation.
Main Methods:
- A two-step acid/alkali separation method assisted by l-cysteine.
- Comprehensive characterization of isolated l-cysteine lignins (LCLs) using 2D NMR, 31P NMR, and thioacidolysis.
- Hydrogenolysis of LCLs to assess monomer yield.
- Mechanistic studies using dimeric model compounds.
Main Results:
- L-cysteine assisted separation preserved a significantly higher β-O-4 content compared to control methods.
- LCLs yielded a substantially higher monomer yield during hydrogenolysis.
- L-cysteine was found to suppress lignin condensation reactions during the isolation process.
Conclusions:
- L-cysteine acts as an effective protective agent, likely at the α-carbon, during lignin isolation.
- This novel method offers improved selective fractionation of lignin from biomass.
- The findings provide new insights for the full valorization of lignocellulosic biomass.
