Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): W. Zhu; Carl J. HoutmanJ.Y. ZhuRoland Gleisner; K.F. Chen
    Date: 2012
    Source: Elsevier
    Publication Series: Scientific Journal (JRNL)
    PDF: Download Publication  (1.1 MB)


    A combined hydrolysis factor (CHF) was developed to predict xylan hydrolysis during pretreatments of native aspen (Populus tremuloides) wood chips. A natural extension of previously developed kinetic models allowed us to account for the effect of catalysts by dilute acid and two sulfite pretreatments at different pH values. When xylan is modeled as two fractions with different hydrolysis rates, previously identified as fast and slow xylan, the model closely matches the experimental data. Extent of xylan hydrolysis is strongly correlated with pretreatment solids yield, energy consumption for size reduction, and substrate enzymatic digestibility (SED). Composition of the pretreatment hydrolysate was less correlated with extent of hydrolysis due to carbohydrate decomposition reactions. Substrate cellulose enzymatic conversion and enzymatic hydrolysis glucose yield can be predicted to approximately 10% accuracy using CHF alone.

    Publication Notes

    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.


    Zhu, W.; Houtman, Carl J.; Zhu, J.Y.; Gleisner, Roland; Chen, K.F. 2012. Quantitative predictions of bioconversion of aspen by dilute acid and SPORL pretreatments using a unified combined hydrolysis factor (CHF). Process Biochemistry. 47: 785-791. doi: 10.1016/j.procbio.2012.02.012.


    Google Scholar


    Combined severity or hydrolysis factor, Hemicellulose/xylan hydrolysis, Kinetic model, Pretreatment, Biomass/lignocellulose bioconversion, Enzymatic saccharification/hydrolysis

    Related Search

    XML: View XML
Show More
Show Fewer
Jump to Top of Page