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Bioethanol Production from Soybean Residue via Separate Hydrolysis and Fermentation

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Abstract

Bioethanol was produced using polysaccharide from soybean residue as biomass by separate hydrolysis and fermentation (SHF). This study focused on pretreatment, enzyme saccharification, and fermentation. Pretreatment to obtain monosaccharide was carried out with 20% (w/v) soybean residue slurry and 270 mmol/L H2SO4 at 121 °C for 60 min. More monosaccharide was obtained from enzymatic hydrolysis with a 16 U/mL mixture of commercial enzymes C-Tec 2 and Viscozyme L at 45 °C for 48 h. Ethanol fermentation with 20% (w/v) soybean residue hydrolysate was performed using wild-type and Saccharomyces cerevisiae KCCM 1129 adapted to high concentrations of galactose, using a flask and 5-L fermenter. When the wild type of S. cerevisiae was used, an ethanol production of 20.8 g/L with an ethanol yield of 0.31 g/g consumed glucose was obtained. Ethanol productions of 33.9 and 31.6 g/L with ethanol yield of 0.49 g/g consumed glucose and 0.47 g/g consumed glucose were obtained in a flask and a 5-L fermenter, respectively, using S. cerevisiae adapted to a high concentration of galactose. Therefore, adapted S. cerevisiae to galactose could enhance the overall ethanol fermentation yields compared to the wild-type one.

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Acknowledgements

This research was supported by Basic Science Research Program through the National Research Foundation of Korea, funded by the Ministry of Education (2016R1D1A1A09918683).

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Correspondence to Sung-Koo Kim.

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Nguyen, T.H., Ra, C.H., Sunwoo, I.Y. et al. Bioethanol Production from Soybean Residue via Separate Hydrolysis and Fermentation. Appl Biochem Biotechnol 184, 513–523 (2018). https://doi.org/10.1007/s12010-017-2565-6

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  • DOI: https://doi.org/10.1007/s12010-017-2565-6

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