Trichoderma reesei cellulases in the bleaching of kraft pulp

Johanna Buchert, Marjatta Ranua, Matti Siika-aho, Jaakko Pere, Liisa Viikari

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Abstract

In this work the effects of individual purified cellulases of Trichoderma reesei were studied in the enzyme-aided bleaching of kraft pulps. The cellobiohydrolases I and II, when used alone, had no positive effect on the bleachability of kraft pulps. The endoglucanase I (EG I), however, acted on pulp similarly to xylanases and with an enzyme dosage of 0.1 mg/g a clear increase in pulp brightness could be observed. Due to the unspecificity of this enzyme, the viscosity of the pulp was simultaneously decreased. Of the cellulases, EG II was clearly most detrimental in reducing the pulp viscosity. Hence, the action of purified cellulases of T. reesei on pulp as a substrate differs profoundly, and all cellulases are not detrimental to the pulp properties.
Original languageEnglish
Pages (from-to)941-945
Number of pages5
JournalApplied Microbiology and Biotechnology
Volume40
Issue number6
DOIs
Publication statusPublished - 1994
MoE publication typeA1 Journal article-refereed

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