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Rapeseed-straw enzymatic digestibility enhancement by sodium hydroxide treatment under ultrasound irradiation

Bioprocess and Biosystems Engineering volume 36, pages 1019–1029 (2013)Cite this article

Abstract

In this study, we carried out sodium hydroxide and sonication pretreatments of rapeseed straw (Brassica napus) to obtain monosugar suitable for production of biofuels. To optimize the pretreatment conditions, we applied a statistical response-surface methodology. The optimal pretreatment conditions using sodium hydroxide under sonication irradiation were determined to be 75.0 °C, 7.0 % sodium hydroxide, and 6.8 h. For these conditions, we predicted 97.3 % enzymatic digestibility. In repeated experiments to validate the predicted value, 98.9 ± 0.3 % enzymatic digestibility was obtained, which was well within the range of the predicted model. Moreover, sonication irradiation was found to have a good effect on pretreatment in the lower temperature range and at all concentrations of sodium hydroxide. According to scanning electron microscopy images, the surface area and pore size of the pretreated rapeseed straw were modified by the sodium hydroxide pretreatment under sonication irradiation.

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Acknowledgments

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2012R1A1A2006718).

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Affiliations

  1. Department of Biotechnology and Bioengineering, Chonnam National University, Gwangju, 500-757, South Korea

    Kyeong Eop Kang & Don-Hee Park

  2. Interdisciplinary Program of Graduate School for Bioenergy and Biomaterials, Chonnam National University, Gwangju, 500-757, South Korea

    Kyeong Eop Kang & Don-Hee Park

  3. Research Institute for Catalysis, Chonnam National University, Gwangju, 500-757, South Korea

    Don-Hee Park

  4. Department of Biotechnology, Pukyong National University, Busan, 608-737, South Korea

    Gwi-Taek Jeong

Authors
  1. Kyeong Eop Kang
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  2. Gwi-Taek Jeong
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  3. Don-Hee Park
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Corresponding authors

Correspondence to Gwi-Taek Jeong or Don-Hee Park.

Additional information

G.-T. Jeong and D.-H. Park have equally contributed as corresponding author to this work.

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Kang, K.E., Jeong, GT. & Park, DH. Rapeseed-straw enzymatic digestibility enhancement by sodium hydroxide treatment under ultrasound irradiation. Bioprocess Biosyst Eng 36, 1019–1029 (2013). https://doi.org/10.1007/s00449-012-0854-6

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  • DOI: https://doi.org/10.1007/s00449-012-0854-6

Keywords

  • Rapeseed-straw
  • Enzymatic digestibility
  • Sodium hydroxide treatment
  • Ultrasound irradiation