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Enzymatic oxidation of lignin phenolic hydroxyl groups can enhance the level of auto adhesion between wood fibers. Previous investigations within the area have not taken the adhesive effect of proteins and carbohydrates in the enzyme solution into consideration, and part of ι he claimed enzyme generated adhesion may merely be a result of the adhesive effect of the proteins and carbohydrates in the enzyme solution. In this paper the enzyme laccase is used to oxidize beech (Fagux sylvatica) wood fibers. Laccase catalyzes a one-electron oxidation of phenolic hydroxyl groups while reducing oxygen, yielding phcnoxy radicals and water. Wet and dry process fiberboards are made from enzyme treated and untreated beech wood fibers. The enzyme treated fiberboards have significantly higher modulus of rupture and modulus of elasticity as well as better dimensional stability. No effect of the protein and …