Fate of residual lignin during delignification of kraft pulp by Trametes versicolor

Article Abstract:

A study was conducted to study the fate of residual lignin during the delignification of kraft pulp by the fungus Trametes versicolor. CO2 trap contents were prepared with scintillation vials and were determined using a Beckman model LS6800 liquid scintillation counter. Kappa values were obtained using the micro kappa method while cellulase treatment was scaled down to a liquid volume of 40 ml. Results showed that the incubation of T. versicolor increased the amounts of 14C and ultraviolet absorbing materials that could be extracted from the pulps.

Fungi, Lignin

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Kraft pulp bleaching and delignification by dikaryons and monokaryons of Trametes versicolor

Article Abstract:

An assessment of the ability of dikaryotic and monokaryotic strains of Trametes versicolor in bleaching and delignifying hardwood and softwood kraft pulps is discussed. Protoplasting was used to derive the two types of strains. Gel electrophoresis was used to reveal the isozyme patterns of the lacase and the manganese peroxide secreted by the strains during bleaching. Results indicate that the total enzyme activity secreted into or functioning in these systems could not be accurately assessed by enzyme assays in pulp bleaching supernatants.

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Lignin peroxidase activity is not important in biological bleaching and delignification of unbleached kraft pulp by Trametes versicolor

Article Abstract:

Trametes versicolor is capable of bleaching and delignifying industrial kraft pulps, making it a candidate to replace chlorine in the commercial pulp-bleaching process. An investigation was conducted to determine if lignin peroxidase plays a role in the biobleaching process. Lignin peroxidase inhibition experiments showed that the enzyme is not required in T. versicolor pulp-biobleaching.

Innovations, Evaluation, Peroxidase, Wood-decaying fungi, Industrial microorganisms

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