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In this study, activities of laccases, xylanases and cellulases produced by Pleurotus ostreatus in liquid-state fermentation were evaluated. Three fermentations were done by triplicate where the carbon source was changed, one was made with glucose, in another was used carboxymethylcellulose and xylan and in the third the three carbon sources were added, in all cases, copper was added as inducer of laccases. The kinetic parameters of growth of the fungus were obtained. It was observed that this fungus produced the three enzymes evaluated; laccases showed the highest values (34,240 U/L) in the culture medium with glucose as sole carbon source. Cellulases showed their highest activity in the culture medium with xylan and carboxymethylcellulose (12,858 U/L) and xylanases in medium with glucose, carboxymethyl cellulose and xylan (27,153 U/L). Up to 4 isoform of laccases, 2 of xylanase and 2 of cellulases were observed by zymography.

Production of laccases, cellulases and xylanases of Pleurotus ostreatus grown in liquid-state fermentation