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Simplification of the Biomass to Ethanol Conversion Process by Using the Whole Medium of Filamentous Fungi Cultivated Under Solid-State Fermentation

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Abstract

A novel simplified configuration is proposed for the conversion of biomass to ethanol using whole medium enzymatic cocktails (WM) and enzymatic extracts (EE) from different filamentous fungi (Trichoderma reesei, Aspergillus niger, and Aspergillus oryzae) cultivated under solid-state fermentation (SSF) for the hydrolysis of steam-exploded sugarcane bagasse (SESB). The hydrolyzed material derived from the saccharification of SESB using the combinations A. niger WM + T. reesei EE, A. oryzae WM + A. niger EE, and A. niger EE + T. reesei WM resulted in the best biomass conversion yields (66, 65, and 64 % of the theoretical reducing sugar yields, respectively). The best ethanol production (84 % of the theoretical yield) was obtained using the material hydrolyzed by a combination of A. oryzae WM + A. niger EE. The enzymatic conversion of SESB using on-site produced enzymes from the whole SSF cultivation medium, followed by an ethanol production step, is a potential configuration for the biomass to ethanol conversion process. This novel simplified configuration would enable the use of a single reactor system, avoiding the need for additional separation steps.

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Acknowledgments

The authors would like to thank Embrapa, CNPq, Capes, and FAPESP (all from Brazil) for their financial support. We also acknowledge Dr. Sonia Couri as the researcher responsible for the isolation and mutation studies of the A. niger 3T5B8 strain and are grateful to Dr. Sandra C. Pereira for the internal review of this paper.

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Authors and Affiliations

  1. Embrapa Instrumentação, Rua XV de Novembro 1452, 13560-970, São Carlos, SP, Brazil

    Rosangela D. P. B. Pirota & Cristiane S. Farinas

  2. Programa de Pós-graduação em Biotecnologia, Universidade Federal de São Carlos, 13565-905, São Carlos, SP, Brazil

    Rosangela D. P. B. Pirota, Priscila S. Delabona & Cristiane S. Farinas

  3. Laboratório Nacional de Ciência e Tecnologia do Bioetanol (CTBE), Rua Giuseppe Maximo Scolfaro 10000, 13083-970, Campinas, SP, Brazil

    Priscila S. Delabona

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  1. Rosangela D. P. B. Pirota
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  2. Priscila S. Delabona
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  3. Cristiane S. Farinas
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Correspondence to Cristiane S. Farinas.

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Pirota, R.D.P.B., Delabona, P.S. & Farinas, C.S. Simplification of the Biomass to Ethanol Conversion Process by Using the Whole Medium of Filamentous Fungi Cultivated Under Solid-State Fermentation. Bioenerg. Res. 7, 744–752 (2014). https://doi.org/10.1007/s12155-013-9406-4

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