Laccase catalyzed bonding of wood fibers
1998
Felby, C. | Olesen, P.O. | Hansen, T.T.
The phenoloxidases laccase and peroxidase can be used for bonding of wood fibers. Binderless fiberboards are made by an oxidative pretreatment of fibers with laccase. Strength enhancement of paper handsheets is accomplished by mixing fibers with laccase and a phenolic polysaccharide. The bonding mechanism is linked to the formation of stable radicals in the fiber lignin matrix. The extent of laccase catalyzed oxidation of fibers, and thereby the performance of the fiberboards, is dependant on the amount of phenolic extractives in the wood species used and the lignin colloids generated by the defibration process. For implementation of the techniques in present-day production of fiberboards and paper and packaging materials, new methods for enzyme treatment under semi-dry conditions need to be developed and low-cost sources of phenolic polysaccharides must be available.
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