The role of ester groups in resistance of plant cell wall polysaccharides to enzymatic hydrolysis

  • K. Grohmann
  • D. J. Mitchell
  • M. E. Himmel
  • B. E. Dale
  • H. A. Schroeder
Session 1 Thermal and Chemical Processing

Abstract

Xylan backbones in native plant cell walls are extensively acety-lated. Previously, no direct investigations as to their role in cellulolytic enzyme resistance have been done, though indirect results point to their importance. An in vitro deesterification of aspen wood and wheat straw has been completed using hydroxylamine solutions. Yields of 90% acetyl ester removal for both materials have been accomplished, with little disruption of other fractions (i.e., lignin). Apparently, as the xylan becomes increasingly deacetylated, it becomes 5–7 times more digestible. This renders the cellulose fraction more accessible, and 2–3 times more digestible. This effect levels off near an acetyl removal of 75%, where other resistances become limiting.

Index Entries

Xylan ester groups cellulase pretreatment 

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Copyright information

© Humana Press Inc. 1989

Authors and Affiliations

  • K. Grohmann
    • 1
  • D. J. Mitchell
    • 1
  • M. E. Himmel
    • 1
  • B. E. Dale
    • 2
  • H. A. Schroeder
    • 2
  1. 1.Solar Fuels Research Diu., Biotechnology BranchSolar Energy Research InstituteGolden
  2. 2.Colorado State UniversityFort Collins

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