4.6 Article

The improvement of sodium hydroxide pretreatment in bioethanol production from Japanese bamboo Phyllostachys edulis using the white rot fungus Phlebia sp MG-60

Journal

INTERNATIONAL BIODETERIORATION & BIODEGRADATION
Volume 133, Issue -, Pages 86-92

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.ibiod.2018.06.010

Keywords

Bioethanol production; Alkaline pretreatment; Consolidated bioprocessing; Phlebia sp MG-60; Phyllostachys edulis

Funding

  1. Ministry of Agriculture, Forestry, and Fisheries of Japan [27006A]

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The concentration range of sodium hydroxide solution (0.0-7.0% w/w) was used to determine the impact of chemical pretreatment in bioethanol production from Japanese bamboo by using the white rot fungus Phlebia sp. MG-60. A pretreatment of sodium hydroxide at 120 degrees C for 1 h demonstrated a significant effect on the removal of lignin and xylan components, leading to an increase in glucan composition for the pretreated bamboo. The saccharification rate was improved from 41.0% in the initial sample to 89.5% in the 7.0% NaOH pretreated sample. This first report on consolidated bioprocessing of Japanese bamboo points out that the highest ethanol yield was 12.8% in 7.0% NaOH pretreated samples, equivalent to 28.5% of polysaccharide volume converted to ethanol, while the conversion proportion in the initial bamboo sample was negligible. Bioethanol production by applying semi-simultaneous saccharification and fermentation showed the highest conversion rate: 58.9% in 7.0% NaOH pretreated samples. However, after considering the weight loss of bamboo samples during pretreatment, the 1.0% NaOH pretreated sample was indicated as the highest ethanol-producing efficiency with 38.1% conversion rate. These results show that sodium hydroxide is an effective pretreatment in combination with Phlebia sp. MG-60 in bioethanol production from Japanese bamboo, with or without commercial hydrolytic enzymes.

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