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The action of fungal cellulases studied using model cellulose films and a quartz crystal microbalance
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0001-8622-0386
(English)Manuscript (Other academic)
Identifiers
URN: urn:nbn:se:kth:diva-6357OAI: oai:DiVA.org:kth-6357DiVA: diva2:11047
Note
QC 20101117Available from: 2006-11-16 Created: 2006-11-16 Last updated: 2010-11-17Bibliographically approved
In thesis
1. Biochemical modification of wood components
Open this publication in new window or tab >>Biochemical modification of wood components
2006 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

The degradation of cellulose found in wood is one of the most important degradation processes for the carbon flux on earth. The degradation is performed by microorganisms that typically use enzymes. Since the cellulose in wood is crystalline and embedded in other polymers, making it inaccessible and durable, the enzymatic methods of cellulose degradation is also complex.

In this thesis, the action of some of these enzymes, called cellulases, have been studied both fundamentally and for industrial purposes. By using model cellulose films and a quartz crystal microbalance it was found that endoglucanases not only depolymerize but also swell model cellulose films. Most probably, this contributes to the synergy seen between endoglucanases and exoglucanases.

When an pulp fibers were pre--treated with endoglucanases and beaten subsequently, the fibers became more swollen than reference fibers. The effects of beating enzyme pre--treated fibers were investigated, indicating that endoglucanases improves the fiber/fiber interaction but also alters the behavior of the fibers in the beating process to become more susceptible to the beating.

The second part of the thesis has been focused on the use of an albino fungi in order to decrease the amount of wood extractives in wood chips prior to thermo mechanical pulp production. The fungus decreased the most troublesome component, the triglycerides, by more than 90 percent in two weeks without any detrimental effects on pulp properties. On the contrary, pulp strength and optical properties were improved.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006. 54 p.
Series
Trita-FPT-Report, ISSN 1652-2443 ; 2006:33
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-4171 (URN)
Presentation
2006-11-24, STFI-salen, KTH, Drottning Kristinas väg 61, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20101117Available from: 2006-11-16 Created: 2006-11-16 Last updated: 2010-11-17Bibliographically approved

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Wågberg, Lars

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