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Size-Exclusion Chromatography01:08

Size-Exclusion Chromatography

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In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
Silica particles offer advantages such as rigidity,...
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Related Experiment Video

Updated: Jul 13, 2025

Ultrafast Lignin Extraction from Unusual Mediterranean Lignocellulosic Residues
09:22

Ultrafast Lignin Extraction from Unusual Mediterranean Lignocellulosic Residues

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Unfolding of Lignin Structure Using Size-Exclusion Fractionation.

Audrey LaVallie1,2, Anastasia A Andrianova1,3, Joshua Schumaker1,4

  • 1Department of Chemistry, University of North Dakota, 151 Cornell St., Mail Stop 9024, Grand Forks, ND 58202, USA.

Polymers
|October 14, 2023
PubMed
Summary
This summary is machine-generated.

New lignin characterization methods reveal its complex structure. Size-exclusion chromatography (SEC) unravels lignin, altering its properties for potentially more efficient biorefinery processing.

Keywords:
indulin AT/alkali/softwood kraft lignin characterizationlignin fractionationlignin narrow molecular weight fractionspreparative size-exclusion chromatography

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Area of Science:

  • Biomass Valorization
  • Polymer Chemistry
  • Analytical Chemistry

Background:

  • Lignin's complex and recalcitrant structure limits its industrial applications.
  • Efficient utilization of lignin requires detailed structural characterization.
  • Previous characterization methods have not fully elucidated lignin's structural heterogeneity.

Purpose of the Study:

  • To apply advanced characterization techniques to understand lignin structure.
  • To investigate the impact of size-exclusion chromatography (SEC) fractionation on lignin structure and properties.
  • To identify structural features that can be leveraged for improved lignin processing.

Main Methods:

  • Preparative size-exclusion chromatography (SEC) for lignin fractionation.
  • Thermal carbon analysis (TCA) for quantitative temperature profiles of carbon evolution.
  • Thermal desorption/pyrolysis gas chromatography-mass spectrometry (TD-Py-GC-MS) and 31P NMR spectroscopy for detailed structural analysis.

Main Results:

  • SEC fractionation disrupted intermolecular associations, 'unraveling' the lignin structure.
  • Fractionated lignin exhibited altered thermal behavior, with significantly reduced char formation (2% vs. 47%) upon pyrolysis.
  • "Unraveled" lignin showed increased accessibility of hydroxyl groups and a higher yield of low-molecular-weight thermal products like guaiacol carbonyls.

Conclusions:

  • Size-exclusion fractionation significantly alters lignin's supramolecular structure and thermal properties.
  • The observed changes in lignin structure and behavior provide insights for optimizing its processing in biorefineries.
  • Advanced characterization methods are crucial for understanding and unlocking lignin's full potential.