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Updated: Jul 8, 2026
10:18
Extraction of Lignin with High β-O-4 Content by Mild Ethanol Extraction and Its Effect on the Depolymerization Yield
Published on: January 7, 2019
One-Pot Depolymerization, Demethylation, and Phenolation of Lignin for Bioactive Polyphenol Production.
Long Li1,2,3, Yuntong Li1,2, Fei Jing1
1Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Nanjing, P. R. China.
Chemsuschem
|July 6, 2026
Summary
This study presents a novel method to transform lignin, a complex biopolymer, into valuable bioactive polyphenols. The process enhances antioxidant and antimicrobial properties, showing promise for sustainable applications.
Area of Science:
- Biopolymer Chemistry
- Sustainable Materials Science
- Biotechnology
Background:
- Lignin's complex structure limits its valorization.
- Developing efficient methods for lignin conversion is crucial for sustainable chemistry.
Purpose of the Study:
- To develop an integrated strategy for lignin depolymerization, demethylation, and phenolation.
- To enhance the bioactivity and functionality of lignin derivatives.
- To explore potential applications in feed additives, cosmeceuticals, and nutraceuticals.
Main Methods:
- Utilizing an acidic lithium bromide molten salt hydrate system for lignin modification.
- Employing spectroscopic analyses (FTIR, 1H NMR, 2D-HSQC NMR) for structural characterization.
- Assessing antioxidant activity (DPPH radical scavenging), antimicrobial efficacy, and safety profiles (IC50).
- Conducting in vivo feeding trials in mice to evaluate growth performance and antiviral protection.
Main Results:
- Efficient cleavage of ether linkages and simplification of lignin structure.
- Significant increase in phenolic hydroxyl (Ar-OH) content, more than doubling native lignin levels.
- Modified lignins demonstrated strong antioxidant (>90% DPPH• scavenging) and antimicrobial (>87% bacterial inhibition) activities.
- Favorable safety profiles (IC50 > 80 mg/L) and improved growth performance and antiviral protection in mice.
- Bioactive polyphenols exhibited performance comparable to or exceeding commercial tannins with economic advantages.
Conclusions:
- The integrated strategy effectively converts technical lignin into high-value bioactive polyphenols.
- Modified lignins possess enhanced bioactivity and safety, suitable for various applications.
- This approach offers a sustainable and economically viable route for lignin valorization.
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