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Efficient utilization of Eucheuma denticulatum hydrolysates using an activated carbon adsorption process for ethanol production in a 5-L fermentor

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Abstract

A total monosaccharide concentration of 37.8 g/L and 85.9% conversion from total fermentable monosaccharides of 44.0 g/L from 110 g dw/L Eucheuma denticulatum slurry were obtained by thermal acid hydrolysis and enzymatic saccharification. Subsequent adsorption treatment to remove 5-hydroxymethylfurfural (5-HMF) using 5% activated carbon and an adsorption time of 10 min were used to prevent a prolonged lag phase, reduced cell growth, and low ethanol production. The equilibrium adsorption capacity (q e) of HMF (58.183 mg/g) showed high affinity to activated carbon comparing to those of galactose (2.466 mg/g) and glucose (2.474 mg/g). The efficiency of cell growth and ethanol production with activated carbon treatment was higher than that without activated carbon treatment. Fermentation using S. stipitis KCTC7228 produced a cell concentration of 3.58 g dw/L with Y X/S of 0.107, and an ethanol concentration of 15.8 g/L with Y P/S of 0.48 in 96 h.

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Acknowledgements

This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2013R1A1A2059095).

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    Authors and Affiliations

    1. Department of Biotechnology, Pukyong National University, Busan, 48513, Korea

      Chae Hun Ra, Gwi-Taek Jeong & Sung-Koo Kim

    2. Federation of Busan Science and Technology, Gijang-gun, Busan, 46048, Korea

      Min Ji Kim

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    1. Chae Hun Ra
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    2. Min Ji Kim
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    4. Sung-Koo Kim
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    Correspondence to Sung-Koo Kim.

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    Chae Hun Ra and Min Ji Kim are co-first author (equal contributors).

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    Ra, C.H., Kim, M.J., Jeong, GT. et al. Efficient utilization of Eucheuma denticulatum hydrolysates using an activated carbon adsorption process for ethanol production in a 5-L fermentor. Bioprocess Biosyst Eng 40, 373–381 (2017). https://doi.org/10.1007/s00449-016-1705-7

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    • DOI: https://doi.org/10.1007/s00449-016-1705-7

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