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Appl Environ Microbiol, June 1998, p. 2117-2125, Vol. 64, No. 6
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Fate of Residual Lignin during Delignification of Kraft Pulp by Trametes versicolor

Ian D. Reid*

Pulp and Paper Research Institute of Canada, Pointe-Claire, Quebec, Canada H9R 3J9

Received 18 November 1997/Accepted 11 March 1998

The fungus Trametes versicolor can delignify and brighten kraft pulps. To better understand the mechanism of this biological bleaching and the by-products formed, I traced the transformation of pulp lignin during treatment with the fungus. Hardwood and softwood kraft pulps containing 14C-labelled residual lignin were prepared by laboratory pulping of lignin-labelled aspen and spruce wood and then incubated with T. versicolor. After initially polymerizing the lignin, the fungus depolymerized it to alkali-extractable forms and then to soluble forms. Most of the labelled carbon accumulated in the water-soluble pool. The extractable and soluble products were oligomeric; single-ring aromatic products were not detected. The mineralization of the lignin carbon to CO2 varied between experiments, up to 22% in the most vigorous cultures. The activities of the known enzymes laccase and manganese peroxidase did not account for all of the lignin degradation that took place in the T. versicolor cultures. This fungus may produce additional enzymes that could be useful in enzyme bleaching systems.

* Mailing address: Paprican, 570 boul. St-Jean, Pointe-Claire, QC, Canada H9R 3J9. Phone: (514) 630-4101, ext. 2244. Fax: (514) 630-4134. E-mail: reid{at}paprican.ca.

Appl Environ Microbiol, June 1998, p. 2117-2125, Vol. 64, No. 6
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


This article has been cited by other articles:

  • Arias, M. E., Arenas, M., Rodriguez, J., Soliveri, J., Ball, A. S., Hernandez, M. (2003). Kraft Pulp Biobleaching and Mediated Oxidation of a Nonphenolic Substrate by Laccase from Streptomyces cyaneus CECT 3335. Appl. Environ. Microbiol. 69: 1953-1958 [Abstract] [Full Text]  
  • Hofrichter, M., Vares, T., Kalsi, M., Galkin, S., Scheibner, K., Fritsche, W., Hatakka, A. (1999). Production of Manganese Peroxidase and Organic Acids and Mineralization of 14C-Labelled Lignin (14C-DHP) during Solid-State Fermentation of Wheat Straw with the White Rot Fungus Nematoloma frowardii. Appl. Environ. Microbiol. 65: 1864-1870 [Abstract] [Full Text]  
  • Reid, I. D., Paice, M. G. (1998). Effects of Manganese Peroxidase on Residual Lignin of Softwood Kraft Pulp. Appl. Environ. Microbiol. 64: 2273-2274 [Abstract] [Full Text]  


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