Document Detail

Treatment of recycled kraft pulps with Trichoderma reesei hemicellulases and cellulases.
MedLine Citation:
PMID:  10702909     Owner:  NLM     Status:  MEDLINE    
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.
T Oksanen; J Pere; L Paavilainen; J Buchert; L Viikari
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of biotechnology     Volume:  78     ISSN:  0168-1656     ISO Abbreviation:  J. Biotechnol.     Publication Date:  2000 Feb 
Date Detail:
Created Date:  2000-03-29     Completed Date:  2000-03-29     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8411927     Medline TA:  J Biotechnol     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  39-48     Citation Subset:  IM    
VTT Biotechnology and Food Research, Finland.
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MeSH Terms
Biotechnology / methods
Cellulase / metabolism*
Conservation of Natural Resources*
Glycoside Hydrolases / metabolism*
Mannosidases / metabolism
Trichoderma / enzymology*
Xylan Endo-1,3-beta-Xylosidase
Xylosidases / metabolism
Reg. No./Substance:
EC 3.2.1.-/Glycoside Hydrolases; EC 3.2.1.-/Mannosidases; EC 3.2.1.-/Xylosidases; EC 3.2.1.-/hemicellulase; EC; EC Endo-1,3-beta-Xylosidase; EC

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