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Dissolution behavior of different celluloses.

Ute Henniges1, Mirjana Kostic, Andrea Borgards

  • 1Department of Chemistry, Christian-Doppler Laboratory, BOKU, University of Natural Resources and Life Sciences, Vienna, Muthgasse 18, A-1190 Vienna, Austria.

Biomacromolecules
|March 12, 2011
PubMed
Summary
This summary is machine-generated.

Dissolving cellulose pulps in DMAc/LiCl reveals varied dissolution times between annual plants and wood. Annual plants show initial hemicellulose enrichment, while wood pulps dissolve quickly, enabling faster GPC analysis for biorefineries.

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Area of Science:

  • Biomass characterization
  • Polymer science
  • Analytical chemistry

Background:

  • Cellulose dissolution is crucial for its analysis.
  • Understanding dissolution kinetics and selectivity is key for accurate molecular characterization.
  • Different cellulose sources (annual plants vs. wood) may exhibit unique dissolution behaviors.

Purpose of the Study:

  • To investigate the stepwise dissolution of celluloses from various origins in DMAc/LiCl.
  • To analyze the time-dependent molecular mass distribution (MMD) and composition of dissolved fractions.
  • To determine optimal dissolution times for reliable gel permeation chromatography (GPC) analysis.

Main Methods:

  • Stepwise dissolution of cellulosic pulps in N,N-dimethylacetamide/lithium chloride (DMAc/LiCl).
  • Gel permeation chromatography (GPC) with multiple detection for MMD and molecular mass analysis.
  • Quantitative analysis of uronic acids (for xylans) and scanning electron microscopy (SEM) for morphological changes.

Main Results:

  • Dissolution times varied significantly, with annual plants generally requiring longer than wood pulps.
  • Early fractions of annual plant cellulose showed hemicellulose enrichment, indicating discrimination.
  • Wood pulps dissolved rapidly without significant MMD changes; bagasse pulp behaved similarly to wood.
  • Extended dissolution times did not improve GPC results, suggesting shorter times are sufficient.

Conclusions:

  • Dissolution kinetics and selectivity differ between annual plant and wood celluloses.
  • Optimized, shorter dissolution times are feasible for reliable cellulose GPC analysis.
  • This finding is significant for high-throughput analytics in biorefineries.