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Related Experiment Video

Updated: Jun 18, 2026

Quantitative 31P NMR Analysis of Lignins and Tannins
05:57

Quantitative 31P NMR Analysis of Lignins and Tannins

Published on: August 2, 2021

Structure-bioactivity relationships in lignins: A multivariate analysis.

Sepideh Kianian1, Mojgan Nejad2, Eric L Hegg1

  • 1Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI, 48824, United States.

International Journal of Biological Macromolecules
|June 16, 2026
PubMed
Summary

Syringyl-rich technical lignins show enhanced antioxidant and antibacterial properties. Their bioactivity is linked to phenolic hydroxyl groups and syringyl content, making them promising for various applications.

Keywords:
Antibacterial activityAntioxidant activityLignin

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Area of Science:

  • Biomass Valorization
  • Polymer Chemistry
  • Medicinal Chemistry

Background:

  • Technical lignins are abundant biopolymers with diverse applications.
  • Understanding structure-bioactivity relationships is crucial for optimizing lignin utilization.
  • Various isolation methods yield lignins with distinct structural features.

Purpose of the Study:

  • To comprehensively characterize diverse technical lignins.
  • To elucidate the relationship between lignin structure and bioactivity (antioxidant and antibacterial).
  • To identify key structural features governing lignin bioactivity.

Main Methods:

  • Lignin isolation via Kraft, soda, organosolv, sulfite, hydrolysis, and Cu-AHP processes.
  • Characterization using GPC, 31P NMR, DSC, TGA, and ICP-OES.
  • Bioactivity assessment via DPPH assay, MIC, and agar diffusion tests.

Main Results:

  • Syringyl-rich lignins and those with free phenolic hydroxyl groups exhibited superior antioxidant and antibacterial activity.
  • MIC values against S. aureus were as low as 1.56 mg/mL.
  • Positive correlation between syringyl hydroxyl content and bioactivity; negative correlation between aliphatic hydroxyl content and antioxidant activity.

Conclusions:

  • Lignin bioactivity is primarily governed by phenolic functionality and syringyl content.
  • Syringyl-rich lignins' enhanced performance is attributed to methoxy groups stabilizing phenoxy radicals.
  • Structural insights enable targeted lignin modification for improved bioactivity.