Xylan as limiting factor in enzymatic hydrolysis of nanocellulose

Paavo A. Penttilä (Corresponding Author), Anikó Várnai, Jaakko Pere, Tekla Tammelin, Lennart Salmén, Matti Siika-aho, Liisa Viikari, Ritva Serimaa

    Research output: Contribution to journalArticleScientificpeer-review

    86 Citations (Scopus)


    The role of xylan as a limiting factor in the enzymatic hydrolysis of cellulose was studied by hydrolysing nanocellulose samples prepared by mechanical fibrillation of birch pulp with varying xylan content. Analyzing the nanocelluloses and their hydrolysis residues with dynamic FT-IR spectroscopy revealed that a certain fraction of xylan remained tightly attached to cellulose fibrils despite partial hydrolysis of xylan with xylanase prior to pulp fibrillation and that this fraction remained in the structure during the hydrolysis of nanocellulose with cellulase mixture as well. Thus, a loosely bound fraction of xylan was predicted to have been more likely removed by purified xylanase. The presence of loosely bound xylan seemed to limit the hydrolysis of crystalline cellulose, indicated by an increase in cellulose crystallinity and by preserved crystal width measured with wide-angle X-ray scattering. Removing loosely bound xylan led to a proportional hydrolysis of xylan and cellulose with the cellulase mixture.
    Original languageEnglish
    Pages (from-to)135-141
    JournalBioresource Technology
    Publication statusPublished - 2013
    MoE publication typeA1 Journal article-refereed


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