Patent ID: 9222078
Filing Date: 2015-12-29
Classification: C12N,D21C

Abstract:
1. A method for bleaching pulp, comprising contacting the pulp in an aqueous solution at from about pH 2 to about pH 7 with a plant peroxidase, a source of hydrogen peroxide, and a mediator having the chemical structure: wherein U1, U2 and U3 are identical or different, and are O, S or NOH; and R1 and R2 are identical or different, and are hydrogen, hydroxyl, formyl, carbamoyl or sulfono radical, ester or salt of the sulfono radical, sulfamoyl, nitro, nitroso, amino, cyano, phenyl, benzyl C 1 -C 4 -alkyl, C 1 -C 4 -alkoxy, C 1 -C 4 -carbonyl, or carbonyl-C 1 -C 4 -alkyl, wherein the plant peroxidase comprises or consists of an amino acid sequence which has at least 95% sequence identity to SEQ ID NO:3, or SEQ ID NO:4.