Effect of tributylphenyltetraethoxylate on enzyme production of Pleurotus ostreatus

The effect of the addition of the nonionic surfactant tributylphenyl-tetraethoxylate to culture media on pH and extracellular protein content, and on production of β-glucosidase, xylanase, laccase, and manganese-dependent and-independent peroxidases by the edible fungus Pleurotus ostreatus was determined. The relationship between fermentation parameters and concentration of surfactant was assessed by multiple linear regression analysis, and the similarities and differences among the fermentation parameters were elucidated by principal component analysis. Calculations proved that except for xylanase all other cultivation parameters were significantly influenced by the surfactant, with the effect higher at higher surfactant concentrations. Surfactant increased the production of β-glucosidase and inhibited laccase and manganese-dependent and-independent peroxidase activities.