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Quantitative 31P NMR Analysis of Lignins and Tannins
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Evidence for Complex Molecular Architectures for Solvent-Extracted Lignins.

Shane E Harton, Sai Venkatesh Pingali, Grady A Nunnery

  • 1Center for Renewable Carbon, The University of Tennessee, Knoxville, Tennessee, 37996, United States.

ACS Macro Letters
|May 24, 2022
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Area of Science:

  • Biopolymer Science
  • Materials Science
  • Renewable Resources

Background:

  • Lignin, a natural biopolymer, is often undervalued as industrial waste.
  • Understanding lignin's complex molecular structure is crucial for advanced materials and biofuel production.
  • Biomass recalcitrance, linked to lignin structure, hinders efficient biofuel extraction.

Purpose of the Study:

  • To elucidate the molecular architecture of solvent-extracted lignins.
  • To investigate the impact of acyl chloride modification on lignin structure.
  • To correlate molecular structure with lignin's potential for value-added applications.

Main Methods:

  • Small-angle X-ray (SAXS) and neutron (SANS) scattering in tetrahydrofuran (THF) solution.
  • Hydrodynamic characterization via dilute solution viscometry and gel permeation chromatography (GPC) in THF.
  • Mass spectrometry for absolute molecular weight determination.

Main Results:

  • Lignin molecular weights varied significantly between mass spectrometry (18-30 kDa) and GPC (∼3 kDa).
  • Lignin structures were characterized as rigid and complex, resembling nanogels or hyperbranched macromolecules, not linear chains.
  • Findings align with proposed delignification mechanisms and challenge previous structural assumptions.

Conclusions:

  • Solvent-extracted lignins possess complex, non-linear molecular architectures.
  • Advanced characterization methods reveal lignin's potential beyond fuel applications.
  • This research guides lignin extraction and genetic engineering for sustainable materials.