Optimization of lignocellulolytic enzyme production by the white-rot fungus Trametes trogii in solid-state fermentation using response surface methodology

The white-rot basidiomicete Trametes trogii (MYA 28-11) is an outstanding producer of laccase. A Doehlert experimental design was applied o optimize its lignocellulolytic enzyme production in solid-state fermentation. The impact on enzyme production of three quantitative variables, amely pH, copper and nitrogen concentrations, was investigated by using a wood-based solid medium supplemented with malt extract. Optimization as aimed at simultaneously minimizing cellulase activity and maximizing ligninolytic enzyme production. Such conditions were: pH 4.5, peptone 2.5 g l−1, and CuSO4 11 mM. Highest activities achieved were: laccase 901 and Mn-peroxidase 20 U g−1. There was not a direct correlation etween the levels of enzymatic activities and the extent of losses of wood weight or components. The factorial approach also allowed us to uantify the enzyme activity in any part of the experimental domain, consequently, it was also possible to determine a culture medium to obtain rude extracellular extracts with high laccase (510 U g−1) and endoxylanase (780 U g−1) yields. These enzymes have gained renewed interest ainly due to their applications in paper industries for pulp treatment, improving the effectiveness of conventional bleaching. Considering the esults obtained, T. trogii could be an attractive source of both enzymes. 2007 Elsevier B.V. All rights reserved.