Abstract
The present work aims a systematic kinetic investigation of the delignification action of the laccase-mediator system in the presence of oxygen. A dimensionless quantity a representing the degree of delignification was used as a criterion for the enzyme efficiency. It was found that the exponential equation which describes the kinetics of processes taking place on a uniformly inhomogeneous surface, fits the experimental results with the highest degree of statistical confidence. The activation energy Eobtained is independent of the delignification degree a, while the pre-exponential factor A decreases in the course of the process. It is mostly connected to the spatial limitations, the exhaustion of phenolic subunits available as well as to the decrease of the indirect activity of the non-phenolic structure in the lignin.
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Valtcheva, E., Veleva, S., Radeva, G. et al. Enzyme action of the laccase-mediator system in the pulp delignification process. Reaction Kinetics and Catalysis Letters 78, 183–191 (2003). https://doi.org/10.1023/A:1022538621950
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DOI: https://doi.org/10.1023/A:1022538621950