Studies on mediators of manganese peroxidase for bleaching of wood pulps

• Published in: Bioresource technology 2002-12, Vol.85 (3), p.249-252
• Main Authors: Bermek, Hakan, Li, Kaichang, Eriksson, Karl-Erik L
• Format: Article
• Language: English
• Subjects: Applied sciences; Basidiomycota - enzymology; bleaching; Carboxylic Acids - chemistry; Enzyme Activation; Exact sciences and technology; Laccase; Lignin - chemistry; Lignin degradation; linoleic acid; linolenic acid; Lipid peroxidation; Lipids - chemistry; Manganese peroxidase; Mediator; Oxidoreductases - chemistry; Paper, paperboard, non wovens; Peroxidases - biosynthesis; Peroxidases - chemistry; Peroxidases - isolation & purification; Polymer industry, paints, wood; polysorbates; Polysorbates - chemistry; pulp; Pulp bleaching; Pulp manufacturing; Quality Control; Sensitivity and Specificity; Statistics as Topic; Sulfhydryl Compounds - chemistry; Wood; Wood. Paper. Non wovens
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/S0960-8524(02)00132-3

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.