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14:53
Techniques for the Evolution of Robust Pentose-fermenting Yeast for Bioconversion of Lignocellulose to Ethanol
Published on: October 24, 2016
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Modified method combining in situ detoxification with simultaneous saccharification and cofermentation (SSCF) as a
Jian Zhang1, Wen-xue Zhang, Ling You
1Key Laboratory of Fermentation Resource and Application of Institutes of Higher Learning in Sichuan/Department of Life Science and Food Engineering, Yibin University , Yibin, Sichuan 644005, China.
Journal of Agricultural and Food Chemistry
|July 8, 2014
Summary
This study presents an improved bioethanol production process using rice straw, achieving high yields through simultaneous saccharification, detoxification, and cofermentation. The optimized method effectively removes inhibitors, making pre-detoxification unnecessary for efficient ethanol generation.
Area of Science:
- Biotechnology
- Renewable Energy
- Biochemical Engineering
Background:
- Rice straw is an abundant lignocellulosic biomass resource.
- Efficient conversion of rice straw to bioethanol faces challenges due to inhibitors generated during pretreatment.
- Developing cost-effective and high-yield bioethanol production methods is crucial for sustainable energy.
Purpose of the Study:
- To develop an improved fermentation process for bioethanol production from rice straw.
- To investigate simultaneous saccharification, detoxification, and cofermentation (SSDC) for enhanced efficiency.
- To evaluate the effectiveness of in situ detoxification during fermentation.
Main Methods:
- Rice straw was pretreated using steam explosion (SE) or butanone solution explosion (BSE).
- Cofermentation was performed using Saccharomyces cerevisiae and Candida shehatae in a ventilated fermenter.
- Optimized fermentation conditions included specific dry matter content, addition rates, fermentation time, and ammonium sulfate dosage.
Main Results:
- Optimized conditions yielded 25.8 g/100 g dry matter ethanol with 88% total sugar utilization from BSE rice straw.
- Ethanol yields were comparable between detoxified and non-detoxified materials.
- In situ fermentation effectively removed inhibitors like furfural, 5-HMF, acetic acid, and butanone, with low residual sugar concentrations.
Conclusions:
- Simultaneous saccharification, detoxification, and cofermentation is an effective and inexpensive strategy for bioethanol production from pretreated rice straw.
- Omitting pre-detoxification and strain pre-adaptation steps simplifies the process without compromising ethanol yield.
- This improved process offers a promising route for sustainable bioethanol generation from lignocellulosic biomass.
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