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Oxalic acid extraction as a posttreatment to increase the brightness of kraft pulps bleached by white-rot fungi

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Biotechnology Techniques

Abstract

Pulp brightness gains obtained by fungal biobleaching are often decreased by dark MnO2 deposits which are formed by the biologically-mediated oxidation of Mn(II). Oxalic acid extraction of O2-delignified kraft pulps bleached by several white-rot fungi was found to increase pulp brightness by up to 9.7 ISO points due to MnO2 dissolution. These results indicate that pulp extraction with oxalic acid can be used in order to accurately assess the net brightness gains achieved by fungal biobleaching.

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Authors and Affiliations

  1. Division of Wood Science, Department of Forestry, Wageningen Agricultural University, P.O. Box 342, 6700 AH, Wageningen, The Netherlands

    M. T. Moreira, G. Feijoo & R. Sierra-Alvarez

  2. Department of Chemical Engineering, University of Santiago de Compostela, E-15706 Santiago de Compostela, Galiza, Spain

    M. T. Moreira & G. Feijoo

  3. Division of Industrial Microbiology, Department of Food Science, Wageningen Agricultural University, Bomenweg 2, 6700 EV, Wageningen, The Netherlands

    J. Lema & J. A. Field

Authors
  1. M. T. Moreira
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  2. G. Feijoo
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  3. J. Lema
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  4. J. A. Field
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  5. R. Sierra-Alvarez
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Moreira, M.T., Feijoo, G., Lema, J. et al. Oxalic acid extraction as a posttreatment to increase the brightness of kraft pulps bleached by white-rot fungi. Biotechnol Tech 10, 559–564 (1996). https://doi.org/10.1007/BF00157361

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  • DOI: https://doi.org/10.1007/BF00157361

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