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Laccase–mediator systems have the disadvantage that the mediator is expensive and potentially toxic. In this work, we used N-hydroxyacetanilide (NHA) in combination with laccase for the first time to bleach eucalypt pulp and found it to be a very promising, advantageous alternative to 1-hydroxybenzotriazole (HBT) as mediator. Thus, NHA is efficiently oxidized by laccase to a radical that absorbs light...
The variation of the contents in hexenuronic acids (HexA) and lignin in Eucalyptus kraft pulp during sequences with the laccase–mediator treatment with or without xylanase pretreatment was studied. The laccase–HBT system (HBT: 1-hydroxybenzotriazole) initially oxidized lignin alone but altered cellulose in the pulp as well after some time. Once all accessible lignin was removed, the system acted on...
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