Applied Biochemistry and Biotechnology

, Volume 146, Issue 1–3, pp 119–128 | Cite as

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

  • Xianyun Sun
  • Ziyong Liu
  • Yinbo QuEmail author
  • Xuezhi Li


The effects of the starch, protein, and soluble oligosaccharides contents in wheat bran on the extracellular biomass-hydrolyzing enzymes activities released by Penicillium decumbens mycelia grown in batch fermentations have been examined. The results showed increased starch content correlated directly with an increase in released amylase activity but inversely with the levels of secreted cellulase and xylanase. High amounts of protein in wheat bran also reduced the activities of cellulase, xylanase and protease in the culture medium. The effects of the soluble and insoluble components of wheat bran and cello-oligosaccharides supplements on production of extracellular cellulase and xylanase were compared. The soluble cello-oligosaccharides compositions in wheat bran were proved to be one of the most significant factors for cellulase production. According to the results of this research, determining and regulating the composition of wheat bran used as a fermentation supplement may allow for improved induction of cellulase and xylanase production.


Penicillium decumbens Wheat bran Biomass Cellulase Xylanase 



This work was supported by National Natural Science Foundation of China (grant no. 30570049) and State Key Development Program for Basic Research of China (grant no. 2003CB716006). The authors are grateful to Prof. John N. Reeve (Department of Microbiology, Ohio State University, USA) for valuable insights and discussions on the manuscript.


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Copyright information

© Humana Press Inc. 2007

Authors and Affiliations

  1. 1.State Key Laboratory of Microbial TechnologyShandong UniversityJinanChina

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