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

112 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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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.

KW - Recycling of kraft pulp

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