title: Studies on mediators of manganese peroxidase for bleaching of wood pulps.
abstract: In order to enhance the bleaching effect of manganese peroxidase (MnP), unsaturated fatty acids, thiol-containing compounds and various other organic compounds were applied in pulp bleaching experiments with MnP. Thiol-containing compounds did not improve the pulp bleaching effect by MnP. Some unsaturated fatty acids, linoleic acid and linolenic acid provided a better pulp bleaching effect than Tween 80. The correlation between the number of C=C bonds in a fatty acid and its pulp bleaching effect was also investigated. The MnP pulp bleaching capability was shown to depend on the carboxylic acid used. A combination of Tween 80 and a carboxylic acid resulted in higher pulp brightness than that obtained with Tween 80 alone. A laccase mediator, 3-hydroxy-1,2,3-benzotriazin-4(3H)-one, could also enhance the MnP pulp bleaching effect.
mesh_terms: D001487:Basidiomycota / Q000201:enzymology; D002264:Carboxylic Acids / Q000737:chemistry*; D004789:Enzyme Activation; D042845:Laccase; D008031:Lignin / Q000737:chemistry*; D008055:Lipids / Q000737:chemistry*; D010088:Oxidoreductases / Q000737:chemistry; D010209:Paper; D010544:Peroxidases / Q000096:biosynthesis / Q000737:chemistry* / Q000302:isolation & purification; D011136:Polysorbates / Q000737:chemistry; D011786:Quality Control; D012680:Sensitivity and Specificity; D013223:Statistics as Topic; D013438:Sulfhydryl Compounds / Q000737:chemistry*; D014934:Wood
chemical_list: D002264:Carboxylic Acids; D008055:Lipids; D011136:Polysorbates; D013438:Sulfhydryl Compounds; C076151:Kraft lignin; D008031:Lignin; D010088:Oxidoreductases; D042845:Laccase; D010544:Peroxidases; C051129:manganese peroxidase