Journal
BIORESOURCE TECHNOLOGY
Volume 131, Issue -, Pages 218-225Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2012.11.089
Keywords
Lignocellulose; Wheat thin stillage; Optimization; Ergosterol; Bioethanol
Funding
- CENIT I+DEA project
- CDTI, Spain
- EU
- MICINN
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Irpex lacteus is a white-rot fungus capable of increasing sugar recovery from wheat straw; however, in order to incorporate biopretreatment in bioethanol production, some process specifications need to be optimized. With this objective, I. lacteus was grown on different liquid culture media for use as inoculums. Additionally, the effect of wheat straw particle size, moisture content, organic and inorganic supplementations, and mild alkali washing during solid-state fermentation (SSF) on sugar yield were investigated. Wheat thin stillage was the best medium for producing inoculums. Supplementation of wheat straw with 0.3 mM Mn(II) during SSF resulted in glucose yields of 68% as compared to yields of 62% and 33% for cultures grown without supplementation or on untreated raw material, respectively after 21 days. Lignin loss, wheat straw digestibility, peroxidase activity, and fungal biomass were also correlated with sugar yields in the search for biopretreatment efficiency indicators. (C) 2012 Elsevier Ltd. All rights reserved.
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