Abstract
The white rot fungi Stereum ostrea displayed a wide diversity in their response to supplemented inducers, surfactants, and copper sulphate in solid state fermentation. Among the inducers tested, 0.02% veratryl alcohol increased the ligninolytic enzyme production to a significant extent. The addition of copper sulphate at 300 μM concentration has a positive effect on laccase production increasing its activity by 2 times compared to control. Among the surfactants, Tween 20, Tween 80, and Triton X 100, tested in the studies, Tween 80 stimulated the production of ligninolytic enzymes. Biosorption of dyes was carried out by using two lignocellulosic wastes, rice bran and wheat bran, in 50 ppm of remazol brilliant blue and remazol brilliant violet 5R dyes. These dye adsorbed lignocelluloses were then utilized for the production of ligninolytic enzymes in solid state mode. The two dye adsorbed lignocelluloses enhanced the production of laccase and manganese peroxidase but not lignin peroxidase.
Highlights
Most textile industries produced a large amount of wastewater with the excessive colour
Laccase activity is increased by 1.9 times (32,675 U/g of dry substrate) compared to control (17,153 U/g of dry substrate) and an increase of 50% was noted in manganese dependent peroxidase (MnP) and lignin peroxidase (LiP) production in veratryl alcohol provided flasks
The ligninolytic activity of white rot fungi depends on many factors, and each strain responds in a particular way to each of these factors
Summary
Most textile industries produced a large amount of wastewater with the excessive colour. Reducing the cost of enzyme production by using cheaper raw materials and optimizing the fermentation process for industrial purposes is the ultimate target of basic research [7, 8]. A good strategy for this purpose is the production of these enzymes by solid state fermentation (ssf) technique using agroindustrial wastes as a support substrate. Most of such wastes are rich in soluble carbohydrates and contain inducers of laccase synthesis, ensuring an efficient production of these enzymes [9]. SSF processes have shown to be suitable for the production of enzymes by filamentous fungi, since they reproduce the natural living conditions of such fungi due to which they may be more capable of producing certain enzymes with high productivity in comparison to submerged fermentation [10]
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