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Updated: May 16, 2025

Ultrafast Lignin Extraction from Unusual Mediterranean Lignocellulosic Residues
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Integrated process for lignin depolymerization and nanoparticle production using deep eutectic solvent.

Jungkyu Kim1, Chaeeun Kim1, Chaewoo Jeong1

  • 1Department of Agriculture, Forestry and Bioresources, College of Agriculture & Life Sciences, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea.

Scientific Reports
|April 6, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces an eco-friendly process using deep eutectic solvents (DESs) to break down lignin into nanoparticles. These lignin nanoparticles show improved stability and thermal properties, offering sustainable valorization pathways.

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Area of Science:

  • Biomass Valorization
  • Green Chemistry
  • Materials Science

Background:

  • Lignin, a complex natural polymer, is abundant but underutilized due to processing challenges.
  • Conventional methods for lignin modification often involve harsh chemicals and limited efficiency.
  • Developing sustainable routes for lignin depolymerization and functionalization is crucial for biorefineries.

Purpose of the Study:

  • To develop an environmentally friendly continuous process for lignin depolymerization.
  • To produce stable lignin nanoparticles (DLNPs) with enhanced properties.
  • To explore the potential of deep eutectic solvents (DESs) in lignin valorization.

Main Methods:

  • Utilized a continuous process employing deep eutectic solvents (DESs) composed of choline chloride and lactic acid.
  • Depolymerized lignin using DESs, followed by in-situ formation of lignin nanoparticles.
  • Characterized the resulting depolymerized lignin nanoparticles (DLNPs) using chemical and thermal analyses.

Main Results:

  • DESs effectively depolymerized lignin, primarily cleaving β-O-4 linkages while preserving aromaticity.
  • DLNPs exhibited uniform particle size, enhanced surface charge, and excellent dispersion stability.
  • The continuous DES process yielded DLNPs with superior thermal stability compared to kraft lignin.

Conclusions:

  • The DES-based continuous process offers a sustainable and efficient method for lignin nanoparticle production.
  • DLNPs show promise for high-value applications, including flame retardants, due to improved thermal stability.
  • This approach provides a viable alternative to traditional organic solvent-based methods for lignin valorization.