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Pulp properties and their influence on enzymatic degradability.

Verena Gehmayr1, Herbert Sixta

  • 1Kompetenzzentrum Holz GmbH , Altenberger Straße 69, 4040 Linz, Austria.

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Enzymatic treatment of pulp improves dissolving pulp production by enhancing cellulose accessibility. Alkaline treatment converting cellulose I to II significantly boosts enzyme effectiveness, though acid treatment yields higher reactivity.

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Area of Science:

  • Biotechnology and Biomaterials
  • Cellulose Science and Technology
  • Pulp and Paper Chemistry

Background:

  • Endoglucanase treatment offers a promising route for producing dissolving pulps from paper-grade pulps by adjusting viscosity and increasing reactivity.
  • Commercial application of enzymatic treatments requires understanding how pulp properties influence enzymatic degradability.

Purpose of the Study:

  • To investigate the impact of pulp properties (carbohydrate composition, pulp type, cellulose morphology) on enzymatic degradability.
  • To evaluate the influence of cellulose morphology conversion on enzyme accessibility and degradation efficiency.

Main Methods:

  • Examined enzymatic degradability of pulps with varying carbohydrate composition and morphology.
  • Investigated the effect of alkaline treatment to convert cellulose morphology from I to II.
  • Compared pulp reactivity after enzymatic degradation versus acid-catalyzed hydrolysis.

Main Results:

  • High hemicellulose and lignin content negatively impacts enzyme accessibility to cellulose.
  • Conversion to cellulose II morphology via alkaline treatment significantly enhances cellulose accessibility and enzymatic degradability.
  • Acid treatment resulted in higher pulp reactivity compared to enzymatic degradation for softwood sulfite pulps.

Conclusions:

  • Pulp properties critically influence enzymatic degradability, with cellulose morphology being a key factor.
  • Alkaline treatment to form cellulose II is effective for improving enzymatic pulp processing.
  • Enzymatic and acid hydrolysis yield different reactivity outcomes, necessitating tailored approaches for dissolving pulp production.