Abstract
Three types of sprucewood chemical pulps, which differed in their characteristics, were treated with two xylanases and two mannanases of fungal and bacterial origin. The effect of the enzymes was measured in terms of a range of chemical and physical pulp properties, in order to obtain a clearer understanding of the reaction of hemicellulases on pulps. The amount of carbohydrates dissolved by the enzymes seems to be dependent on the size of the enzyme, the accessible surface area of the pulp, and topochemical substrate restrictions. Xylanases released more carbohydrates compared to mannanases. There was a synergistic effect observed with combined treatments using xylanases and mannanases. Using different techniques it could be shown that internal structural changes in the pulp fibres occurred in addition to the well-known surface modifications
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