Treatment of recycled kraft pulps with Trichoderma reesei hemicellulases and cellulases

Tarja Oksanen (Corresponding Author), Jaakko Pere, L. Paavilainen, Johanna Buchert, Liisa Viikari

    Research output: Contribution to journalArticleScientificpeer-review

    116 Citations (Scopus)

    Abstract

    Effects of recycling ECF-bleached softwood kraft pulp on pulp properties were evaluated in the laboratory. The tensile strength, fiber flexibility and WRV lost during drying of the pulp were recovered by refining between the cycles which, however, resulted in deteriorated drainage properties. The recycled pulps were treated with purified Trichoderma reesei cellulases and hemicellulases and the changes in fiber properties due to enzymatic treatments were characterized. The endoglucanases (EG I and EG II) significantly improved pulp drainage already at low dosage levels, and EG II was found to be more effective at a given level of carbohydrate solubilization. Combining hemicellulases with the endoglucanase treatments increased the positive effects of the endoglucanases on pulp drainage. However, as a result of the endoglucanase treatments a slight loss in strength was observed. Combining mannanase with endoglucanase treatments appeared to increase this negative effect, whereas the impact of xylanase was not significant. Although the drainage properties of the pulps could be improved by selected enzymes, the water retention capacity of the dried hornified fibers could not be recovered by any of the enzymes tested.
    Original languageEnglish
    Pages (from-to)39 - 48
    Number of pages10
    JournalJournal of Biotechnology
    Volume78
    Issue number1
    DOIs
    Publication statusPublished - 2000
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Cellulases
    Trichoderma
    Cellulase
    Kraft pulp
    Pulp
    Drainage
    Fibers
    Tensile Strength
    Recycling
    Enzymes
    Therapeutics
    Softwoods
    Carbohydrates
    Refining
    hemicellulase
    Water
    Drying
    Tensile strength

    Keywords

    • Recycling of kraft pulp
    • Pulp properties
    • Enzymes
    • Cellulase
    • Hemicellulase

    Cite this

    Oksanen, Tarja ; Pere, Jaakko ; Paavilainen, L. ; Buchert, Johanna ; Viikari, Liisa. / Treatment of recycled kraft pulps with Trichoderma reesei hemicellulases and cellulases. In: Journal of Biotechnology. 2000 ; Vol. 78, No. 1. pp. 39 - 48.
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    abstract = "Effects of recycling ECF-bleached softwood kraft pulp on pulp properties were evaluated in the laboratory. The tensile strength, fiber flexibility and WRV lost during drying of the pulp were recovered by refining between the cycles which, however, resulted in deteriorated drainage properties. The recycled pulps were treated with purified Trichoderma reesei cellulases and hemicellulases and the changes in fiber properties due to enzymatic treatments were characterized. The endoglucanases (EG I and EG II) significantly improved pulp drainage already at low dosage levels, and EG II was found to be more effective at a given level of carbohydrate solubilization. Combining hemicellulases with the endoglucanase treatments increased the positive effects of the endoglucanases on pulp drainage. However, as a result of the endoglucanase treatments a slight loss in strength was observed. Combining mannanase with endoglucanase treatments appeared to increase this negative effect, whereas the impact of xylanase was not significant. Although the drainage properties of the pulps could be improved by selected enzymes, the water retention capacity of the dried hornified fibers could not be recovered by any of the enzymes tested.",
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    author = "Tarja Oksanen and Jaakko Pere and L. Paavilainen and Johanna Buchert and Liisa Viikari",
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    Treatment of recycled kraft pulps with Trichoderma reesei hemicellulases and cellulases. / Oksanen, Tarja (Corresponding Author); Pere, Jaakko; Paavilainen, L.; Buchert, Johanna; Viikari, Liisa.

    In: Journal of Biotechnology, Vol. 78, No. 1, 2000, p. 39 - 48.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Treatment of recycled kraft pulps with Trichoderma reesei hemicellulases and cellulases

    AU - Oksanen, Tarja

    AU - Pere, Jaakko

    AU - Paavilainen, L.

    AU - Buchert, Johanna

    AU - Viikari, Liisa

    PY - 2000

    Y1 - 2000

    N2 - Effects of recycling ECF-bleached softwood kraft pulp on pulp properties were evaluated in the laboratory. The tensile strength, fiber flexibility and WRV lost during drying of the pulp were recovered by refining between the cycles which, however, resulted in deteriorated drainage properties. The recycled pulps were treated with purified Trichoderma reesei cellulases and hemicellulases and the changes in fiber properties due to enzymatic treatments were characterized. The endoglucanases (EG I and EG II) significantly improved pulp drainage already at low dosage levels, and EG II was found to be more effective at a given level of carbohydrate solubilization. Combining hemicellulases with the endoglucanase treatments increased the positive effects of the endoglucanases on pulp drainage. However, as a result of the endoglucanase treatments a slight loss in strength was observed. Combining mannanase with endoglucanase treatments appeared to increase this negative effect, whereas the impact of xylanase was not significant. Although the drainage properties of the pulps could be improved by selected enzymes, the water retention capacity of the dried hornified fibers could not be recovered by any of the enzymes tested.

    AB - Effects of recycling ECF-bleached softwood kraft pulp on pulp properties were evaluated in the laboratory. The tensile strength, fiber flexibility and WRV lost during drying of the pulp were recovered by refining between the cycles which, however, resulted in deteriorated drainage properties. The recycled pulps were treated with purified Trichoderma reesei cellulases and hemicellulases and the changes in fiber properties due to enzymatic treatments were characterized. The endoglucanases (EG I and EG II) significantly improved pulp drainage already at low dosage levels, and EG II was found to be more effective at a given level of carbohydrate solubilization. Combining hemicellulases with the endoglucanase treatments increased the positive effects of the endoglucanases on pulp drainage. However, as a result of the endoglucanase treatments a slight loss in strength was observed. Combining mannanase with endoglucanase treatments appeared to increase this negative effect, whereas the impact of xylanase was not significant. Although the drainage properties of the pulps could be improved by selected enzymes, the water retention capacity of the dried hornified fibers could not be recovered by any of the enzymes tested.

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    KW - Cellulase

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