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Bioethanol production from sweet potato by co-immobilization of saccharolytic molds and Saccharomyces cerevisiae

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  • Lee, Wen-Shiang
  • Chen, I-Chu
  • Chang, Cheng-Hsiung
  • Yang, Shang-Shyng

Abstract

To investigate the bioethanol production from sweet potato, the saccharification and fermentation conditions of co-immobilization of saccharolytic molds (Aspergillus oryzae and Monascus purpureus) with Saccharomyces cerevisiae were analyzed. The immobilized yeast cells showed that at 10% glucose YPD (yeast extract peptone dextrose) the maximum fermentation rate was 80.23%. Viability of yeasts cells were 95.70% at a final ethanol concentration of 6%. Immobilization enhanced the ethanol tolerance of yeast cells. In co-immobilization of S. cerevisiae with A. oryzae or M. purpureus, the optimal hardening time of gel beads was between 15 and 60 min. Bioethanol production was 3.05–3.17% (v v−1) and the YE/s (yield of ethanol production/starch consumption) was 0.31–0.37 at pH 4, 30 °C and 150 rpm during 13 days fermentation period. Co-immobilization of S. cerevisiae with a mixed cultures of A. oryzae and M. purpureus at a ratio of 2:1, the bioethanol production was 3.84% (v v−1), and the YE/s was 0.39 for a 11 days incubation. However a ratio of A. oryzae and M. purpureus at 1:2 resulted a bioethanol production rate of 4.08% (v v−1), and a YE/s of 0.41 after 9 days of fermentation.

Suggested Citation

  • Lee, Wen-Shiang & Chen, I-Chu & Chang, Cheng-Hsiung & Yang, Shang-Shyng, 2012. "Bioethanol production from sweet potato by co-immobilization of saccharolytic molds and Saccharomyces cerevisiae," Renewable Energy, Elsevier, vol. 39(1), pages 216-222.
    • Handle: RePEc:eee:renene:v:39:y:2012:i:1:p:216-222
    DOI: 10.1016/j.renene.2011.08.024
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    References listed on IDEAS

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    1. Tsai, Wen-Tien & Lan, Haw-Farn & Lin, De-Tsai, 2008. "An analysis of bioethanol utilized as renewable energy in the transportation sector in Taiwan," Renewable and Sustainable Energy Reviews, Elsevier, vol. 12(5), pages 1364-1382, June.
    2. Jebaraj, S. & Iniyan, S., 2006. "A review of energy models," Renewable and Sustainable Energy Reviews, Elsevier, vol. 10(4), pages 281-311, August.
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    Cited by:

    1. Mishra, Abhishek & Sharma, Ajay K. & Sharma, Sumit & Bagai, Rashmi & Mathur, Anshu S. & Gupta, Ravi P. & Tuli, Deepak K., 2016. "Lignocellulosic ethanol production employing immobilized Saccharomyces cerevisiae in packed bed reactor," Renewable Energy, Elsevier, vol. 98(C), pages 57-63.
    2. Thangavelu, Saravana Kannan & Ahmed, Abu Saleh & Ani, Farid Nasir, 2016. "Review on bioethanol as alternative fuel for spark ignition engines," Renewable and Sustainable Energy Reviews, Elsevier, vol. 56(C), pages 820-835.
    3. Paola Sakai & Stavros Afionis & Nicola Favretto & Lindsay C. Stringer & Caroline Ward & Marco Sakai & Pedro Henrique Weirich Neto & Carlos Hugo Rocha & Jaime Alberti Gomes & Nátali Maidl de Souza & No, 2020. "Understanding the Implications of Alternative Bioenergy Crops to Support Smallholder Farmers in Brazil," Sustainability, MDPI, vol. 12(5), pages 1-22, March.
    4. Yuelei Yang & Kevin Boots & Dan Zhang, 2012. "A Sustainable Ethanol Distillation System," Sustainability, MDPI, vol. 4(1), pages 1-14, January.
    5. Li, Jun & Zhao, Renyong & Xu, Youjie & Wu, Xiaorong & Bean, Scott R. & Wang, Donghai, 2022. "Fuel ethanol production from starchy grain and other crops: An overview on feedstocks, affecting factors, and technical advances," Renewable Energy, Elsevier, vol. 188(C), pages 223-239.
    6. Zabed, H. & Sahu, J.N. & Suely, A. & Boyce, A.N. & Faruq, G., 2017. "Bioethanol production from renewable sources: Current perspectives and technological progress," Renewable and Sustainable Energy Reviews, Elsevier, vol. 71(C), pages 475-501.

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