Synergism of enzymes in chemical pulp bleaching from an industrial point of view: A critical review

Enzymes are biological catalysts and very specific, catalyzing either a single chemical reaction or limited number of closely related reactions. For example, xylanases enzymes that catalyze the cleavage polymeric xylan thereby break down this hemicellulose. The first xylanase enzyme preparations used in bleaching process pulp also contained cellulase, which catalyzes hydrolysis cellulose. This obviously had an adverse effect on yield quality. Unfortunately, setback gave enzyme-assisted negative reputation. At later stage, producers managed to engineer production strains generated cellulase-free preparations. However, due initial experiences with earlier mixtures, only companies industry have seriously considered using these so-called second-generation their bleach plants. It is apparent improved would bring about significant benefits terms cost savings effluent In addition xylanase-aided bleaching, it possible improve effectivity further by adding other enzymes, such as lipase esterase, create cocktail. may be particularly beneficial hardwood pulp, white birch, often encounters complex troublesome problems wood extractives. By different types at more than one position fiberline, even improvements possible. main objective review discuss advantages incorporating modern pulp.