Abstract
Agaricus brasiliensis CS1, Pleurotus ostreatus H1 and Aspergillus flavus produced holocellulases when grown in solid and submerged liquid cultures containing agro-industrial residues, including sugar cane bagasse and dirty cotton residue, as substrates. These isolates proved to be efficient producers of holocellulases under the conditions used in this screening. Bromatological analysis of agro-industrial residues showed differences in protein, fiber, hemicellulose, cellulose and lignin content. Maximal holocellulase activity (hemicellulase, cellulase and pectinase) was obtained using solid-state cultivation with 10% substrate concentration. In this case, remarkably high levels of xylanase and polygalacturonase activity (4,008 and 4,548 IU/l, respectively) were produced by A. flavus when grown in media containing corn residue, followed by P. ostreatus H1 with IU/l values of 1,900 and 3,965 when cultivated on 5% and 10% sugar cane bagasse, respectively. A. brasiliensis CS1 showed the highest reducing sugar yield (11.640 mg/ml) when grown on medium containing sugar cane bagasse. A. brasiliensis was also the most efficient producer of protein, except when cultivated on dirty cotton residue, which induced maximal production in A. flavus. Comparison of enzymatic hydrolysis of sugar cane bagasse and dirty cotton residue by crude extracts of A. brasiliensis CS1, P. ostreatus H1 and A. flavus showed that the best reducing sugar yield was achieved using sugar cane bagasse as a substrate.
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Acknowledgements
This work was funded by the Department of Education of Federal District (Brazil), the Foundation for Research Support of the Federal District (Brazil, research grant number 193.000.470/2008) and the Brazilian National Research Council (research grant number 470358/2007-6). E.X.F.F. acknowledges the receipt of research fellowship from Brazilian National Research Council.
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de Siqueira, F.G., de Siqueira, A.G., de Siqueira, E.G. et al. Evaluation of holocellulase production by plant-degrading fungi grown on agro-industrial residues. Biodegradation 21, 815–824 (2010). https://doi.org/10.1007/s10532-010-9346-z
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DOI: https://doi.org/10.1007/s10532-010-9346-z