Abstract
The pretreatment of lignocellulosic biomass with white-rot fungi to produce bioethanol is an environmentally friendly alternative to the commonly used physico-chemical processes. After biological pretreatment, a solid substrate composed of cellulose, hemicellulose and lignin, the two latter with a composition lower than that of the initial substrate, is obtained. In this study, six microorganisms and four process configurations were utilised to ferment a hydrolysate obtained from wheat straw pretreated with the white-rot fungus Irpex lacteus. To enhance total sugars utilisation, five of these microorganisms are able to metabolise, in addition to glucose, most of the pentoses obtained after the hydrolysis of wheat straw by the application of a mixture of hemicellulolytic and cellulolytic enzymes. The highest overall ethanol yield was obtained with the yeast Pachysolen tannophilus. Its application in combination with the best process configuration yielded 163 mg ethanol per gram of raw wheat straw, which was between 23 and 35 % greater than the yields typically obtained with a conventional bioethanol process, in which wheat straw is pretreated using steam explosion and fermented with the yeast Saccharomyces cerevisiae.
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Acknowledgements
This work was financially supported by the Biosos Project (CDTI, CEN-200910140) and by the Ministry of Economy and Competitiveness of Spain through the Local Investment Fund for Employment (Government of Spain) and was carried out in collaboration with Abengoa Bionergía Nuevas Tecnologías. The authors thank Novozymes for providing the commercial enzymes. T. Lu-Chau wishes to thank the I. Barreto program from the Galicia Government for financial support. The authors belong to the Galician Competitive Research Group GRC2010/37.
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López-Abelairas, M., Lu-Chau, T.A. & Lema, J.M. Fermentation of Biologically Pretreated Wheat Straw for Ethanol Production: Comparison of Fermentative Microorganisms and Process Configurations. Appl Biochem Biotechnol 170, 1838–1852 (2013). https://doi.org/10.1007/s12010-013-0318-8
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DOI: https://doi.org/10.1007/s12010-013-0318-8