The Effects of Wheat Bran Composition on the Production of Biomass-Hydrolyzing Enzymesby Penicillium decumbens

摘要

The effects of the starch, protein, and soluble oligosaccharides contents in wheatbran on the extracellular biomass-hydrolyzing enzymes activities released by Penicilliumdecumbens mycelia grown in batch fermentations have been examined. The results showedincreased starch content correlated directly with an increase in released amylase activity butinversely with the levels of secreted cellulase and xylanase. High amounts of protein in wheatbran also reduced the activities of cellulase, xylanase and protease in the culture medium. Theeffects of the soluble and insoluble components of wheat bran and cello-oligosaccharidessupplements on production of extracellular cellulase and xylanase were compared. Thesoluble cello-oligosaccharides compositions in wheat bran were proved to be one of the mostsignificant factors for cellulase production. According to the results of this research,determining and regulating the composition of wheat bran used as a fermentation supplementmay allow for improved induction of cellulase and xylanase production.