Bleaching of Hardwood Kraft Pulp with Manganese Peroxidase from Phanerochaete sordida YK-624 without Addition of MnSO(inf4).

Applied and Environmental Microbiology
Koichi HarazonoK Sakai

Abstract

In vitro bleaching of an unbleached hardwood kraft pulp was performed with partially purified manganese peroxidase (MnP) from the fungus Phanerochaete sordida YK-624 without the addition of MnSO(inf4) in the presence of oxalate, malonate, or gluconate as manganese chelator. When the pulp was treated without the addition of MnSO(inf4), the pulp brightness increased by about 10 points in the presence of 2 mM oxalate, but the brightness did not significantly increase in the presence of 50 mM malonate, a good manganese chelator. Residual MnP activity decreased faster during the bleaching with MnP without MnSO(inf4) in the presence of malonate than in the presence of oxalate. Oxalate reduced MnO(inf2) which already existed in the pulp or was produced from Mn(sup2+) by oxidation with MnP and thus supplied Mn(sup2+) to the MnP system. The presence of gluconate, produced by the H(inf2)O(inf2)-generating enzyme glucose oxidase, also improved the pulp brightness without the addition of MnSO(inf4), although treatment with gluconate was inferior to that with oxalate with regard to increase of brightness. It can be concluded that bleaching of hardwood kraft pulp with MnP, using manganese originally existing in the pulp, is possible in the p...Continue Reading

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Citations

Aug 27, 2004·Critical Reviews in Biotechnology·Pratima Bajpai
Feb 22, 2012·Applied Biochemistry and Biotechnology·Nuria González-RábadeJesús Agustín Badillo-Corona
Jul 2, 1998·Applied and Environmental Microbiology·M T MoreiraJ A Field
Aug 8, 2007·Biotechnology and Bioengineering·Fei JiangChristine Kelly
Apr 19, 2008·Applied Biochemistry and Biotechnology·Fei JiangChristine Kelly
Dec 14, 2005·Applied and Environmental Microbiology·M HofrichterW Fritsche
Oct 20, 2005·Journal of Bioscience and Bioengineering·Koichi HarazonoKazunori Nakamura
Jan 11, 2005·Journal of Biotechnology·Cécile SigoillotAngel T Martínez

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