Protease catalyzed treatments of lignocellulose materials

Details Protease catalyzed treatments of lignocellulose materials Protease catalyzed treatments of lignocellulose materials

C - Chemistry, Metallurgy

12

S

C12S 3/08 (2006.01) C12P 21/06 (2006.01) D21C 1/00 (2006.01) D21C 5/00 (2006.01) D21C 9/00 (2006.01)

Patent

CA 2082185

Wood chips or wood pulps are treated at any stage of the papermaking process but preferably prior to delignification or bleaching with a protease enzyme to enhance fibrillation and/or the efficiency of delignification or bleaching. The proteases, pepsin and papain, promote the removal of lignin from wood, possibly through cleavage of the cell wall protein matrix. Wood pulps treated with proteases exhibit a higher degree of fibrillation than pulps not treated with proteases. Furthermore, the protease treatment produces a flatter fiber which improves paper smoothness derived from these fibers. The protease treatment may be combined sequentially or by admixture with treatment with a xylanase or ligninase.

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