Use of a new membrane-reactor saccharification assay to evaluate the performance of celluloses under simulated ssf conditions

Effect on enzyme quality of growing trichoderma reesci. in the presence of targeted lignocellulosic substrate
  • John O. Baker
  • Todd B. Vinzant
  • Christine I. Ehrman
  • William S. Adney
  • Michael E. Himmel
Session 3 Bioprocessing Research

Abstract

A new saccharification assay has been devised, in which a continuously buffer-swept membrane reactor is used to remove the solubilized saccharification products, thus allowing high extents of substrate conversion without significant inhibitory effects from the buildup of either cellobiose or glucose. This diafiltration saccharification assay (DSA) can, therefore, be used to obtain direct measurements of the performance of combinations of cellulase and substrate under simulated SSF conditions, without the saccharification results being complicated by factors that may influence the subsequent fermentation step. This assay has been used to compare the effectiveness of commercial and special in-house-producedTrichoderma reeSci. cellulase preparations in the saccharification of a standardized microcrystalline (Sigmacell) substrate and a dilute-acid pretreated lignocellulosic substrate. Initial results strongly suggest that enzyme preparations produced in the presence of the targeted lignocellulosic substrate will saccharify that substrate more effectively. These results call into question the widespread use of the “filter paper assay” as a reliable predictor of enzyme performance in the extensive hydrolysis of substrates that are quite different from filter paper in both physical properties and chemical composition.

Index Entries

Cellulase digestion Trichoderma reesei pretreated hardwood diafiltration saccharification membrane reactor 
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Copyright information

© Humana Press Inc. 1997

Authors and Affiliations

  • John O. Baker
    • 1
  • Todd B. Vinzant
    • 1
  • Christine I. Ehrman
    • 1
  • William S. Adney
    • 1
  • Michael E. Himmel
    • 1
  1. 1.Enzyme Technology Team, Biotechnology Center for Fuels and ChemicalsNational Renewable Energy LaboratoryGolden

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