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The response of a commercial softwood kraft pulp with an initial kappa no. of 97.5 to laccase/N-hydroxybenzotriazole (HBT) treatments was investigated. A series of 84 enzymatic treatments were performed to determine how the bio-delignification of high kappa pulps is influenced by reaction time, dose of laccase, dose of HBT, and pulp extractives. According to the analysis of variance, time, dose of mediator, dose of laccase, and extractives, all had a statistical effect on delignification at a 95% confidence level. Also, the interaction between the variable dose of laccase and extractives, as well as that between the variable dose of mediator and dose of laccase had a statistical effect on delignification. The results from this preliminary study revealed that a laccase-HBT system can effectively delignify high kappa pulps. A drop in kappa no. greater than 16 points was observed in some treatments.
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Biobleaching of High Lignin Content Kraft Pulps Via Laccase-Mediator Systems, 1998 Pulping Conferenc
