Improved Reactivity and Derivatization of Cellulose after Pre-Hydrolysis with Commercial Enzymes

Pia Willberg-Keyriläinen, Jarmo Ropponen, Manu Lahtinen, Jaakko Pere

    Research output: Contribution to journalArticleScientificpeer-review

    4 Citations (Scopus)

    Abstract

    Reactivity is an important parameter when considering the chemical modification or dissolution of cellulose. Different pretreatment methods affect cellulose reactivity by decreasing its degree of polymerization (DP) and crystallinity. In this study, the molar mass of cellulose was decreased via enzymatic pretreatment. Three commercial endoglucanase-rich products were tested. The target was to reduce the viscosity of the pulp to below 200 mL/g and, thus, increase the reactivity of the cellulose. For comparison, cellulose was also pretreated with ozone, and the effects of each pretreatment method on crystallinity and monosaccharide composition of the resulting pulps were investigated. Both enzymatically treated and ozone-treated pulps were esterified using homogeneous and heterogeneous methods, and the degrees of substitution for these treated pulps were much higher than the esters when the untreated pulp was used. Cellulose esters from the pretreated pulps formed films with good mechanical properties by solvent casting.
    Original languageEnglish
    Pages (from-to)561-574
    Number of pages14
    JournalBioResources
    Volume14
    Issue number1
    Publication statusPublished - 2019
    MoE publication typeNot Eligible

    Keywords

    • Cellulose
    • Enzymatic treatment
    • Ozone treatment
    • Cellulose esters

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