Optimization of liquid-state fermentation medium conditions for high yield cellulase by Trichoderma reesei.

The liquid-state fermentation medium conditions of Trichoderma reesei of high yield cellulase were optimized with natural agricultural products as the main raw materials by different test design methods, such as the Plackett-Burman (PB), steepest climbing, Box-Behnken (BB) and response surface method (RSM) analysis. The results showed that the optimal fermentation medium conditions for enzyme production were soybean meal 2.140%, wheat bran 1.88%, peptone 0.30%. Under these conditions, the cellulase activity of the fermentation broth could reach (42.62±1.30) U/mL. In the later stage of fermentation (5 d), with the large growth of mycelium, the cellulase activity increased continuously. The crude enzyme solution could degrade cellulose and hemicellulose in corn straw to produce fermentable sugars such as free glucose, xylose, arabinose and cellobiose. [ABSTRACT FROM AUTHOR]