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Effects of fiber physical and chemical characteristics on the interaction between endoglucanase and eucalypt fibers

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Abstract

Roles played by fiber physical and chemical characteristics in enzymatic hydrolysis of cellulosic materials were investigated by analyzing the interaction between an endoglucanase complex and eucalypt kraft fibers. PFI refining was employed to create the difference of fiber size distribution and morphology. Oxygen delignification and bleaching were employed to prepare fibers with different lignin and pentosan contents. The enzyme accessibility was monitored by adsorption at 4 °C and during hydrolysis at 40 °C. Molecular weight changes and reducing sugar released were monitored for digestibility of the samples. Greater maximum adsorption capacities of the enzymes were shown for the pulps with shorter and wider fibers and more fine fractions after refining. Highest amount of enzyme was adsorbed onto fibers with the least lignin contents at 4 °C. Fewer desorbed from fibers with higher lignin contents during hydrolysis at 40 °C. For unrefined fibers, less molecular weight reductions were observed for fibers with higher lignin contents. However, extensive fibrillation by refining negated the effects of lignin on the action of endoglucanase, similar molecular weight reductions were observed for fibers with three different lignin contents. Refining could be able to expose more reaction sites on the fiber surface, hence the impacts of lignin and pentosan diminished during hydrolysis for refined fibers.

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Acknowledgments

The authors thank partial financial supports from National Science Council, Taiwan, ROC for this study under project no. 99-3113-P-301-001.

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Authors and Affiliations

  1. School of Forestry and Resource Conservation, National Taiwan University, Taipei, 10617, Taiwan, ROC

    Chun-Han Ko & Fang-**g Chen

  2. Bioenergy Research Center, National Taiwan University, Taipei, 10617, Taiwan, ROC

    Chun-Han Ko

  3. National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan, ROC

    Jey Jau Lee

  4. Institute of Chemistry, Academia Sinica, Taipei, 11529, Taiwan, ROC

    Der-Lii M. Tzou

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  1. Chun-Han Ko
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  2. Fang-**g Chen
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Correspondence to Chun-Han Ko.

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Ko, CH., Chen, FJ., Lee, J.J. et al. Effects of fiber physical and chemical characteristics on the interaction between endoglucanase and eucalypt fibers. Cellulose 18, 1043–1054 (2011). https://doi.org/10.1007/s10570-011-9534-y

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  • DOI: https://doi.org/10.1007/s10570-011-9534-y

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