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Investigation of hydroxamic acids as laccase-mediators for pulp bleaching

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Abstract

A number of hydroxamic acids have been synthesized and investigated as laccase-mediators for pulp bleaching. As compared with N-hydroxyacetanilide (NHA), one of the most effective laccase-mediators reported so far, N-(4-cyanophenyl)acetohydroxamic acid (NCPA), resulted in the highest brightness and lowest kappa number of hardwood kraft pulp of all the laccase-mediators studied. The bleaching efficacy of a laccase/7-cyano-4-hydroxy-2H-1,4-benzoxazin-3-one system was also comparable with that of a laccase/NHA system. A laccase/NCPA system was further studied for the bleaching of unbleached softwood kraft pulp. The effects of pulp consistency, laccase dosage, NCPA dosage, incubation time, and oxygen pressure on the bleaching efficacy of a laccase/NCPA system were studied.

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Acknowledgements

This research was supported by a grant to K.Li from the National Research Initiative Competitive Grants Program of the USDA (Award No. 2001-35103-10149).

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Authors and Affiliations

  1. Department of Wood Science and Engineering, Oregon State University, Corvallis, OR 97331-5751, USA

    X. Geng & K. Li

  2. Novozymes Biotech, Inc., Davis, CA 95616, USA

    F. Xu

Authors
  1. X. Geng
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  2. K. Li
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  3. F. Xu
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Correspondence to K. Li.

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Geng, X., Li, K. & Xu, F. Investigation of hydroxamic acids as laccase-mediators for pulp bleaching. Appl Microbiol Biotechnol 64, 493–496 (2004). https://doi.org/10.1007/s00253-003-1475-4

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  • DOI: https://doi.org/10.1007/s00253-003-1475-4

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