Bioethanol production from steam-exploded rice husk by recombinant Escherichia coli KO11.
Rice husk is one of the most abundant types of lignocellulosic biomass. Because of its significant amount of sugars, such as cellulose and hemicellulose, it can be used for the production of biofuels such as bioethanol. However, the complex structure of lignocellulosic biomass, consisting of cellulose, hemicellulose and lignin, is resistant to degradation, which limits biomass utilization for ethanol production. The protection of cellulose by lignin contributes to the recalcitrance of lignocelluloses to hydrolysis. Therefore, we conducted steam-explosion treatment as pretreatment of rice husk. However, recombinant Escherichia coli KO11 did not ferment the reducing sugar solution obtained by enzymatic saccharification of steam-exploded rice husk. When the steam-exploded rice husk was washed with hot water to remove inhibitory substances and M9 medium (without glucose) was used as a fermentation medium, E. coli KO11 completely fermented the reducing sugar solution obtained by enzymatic saccharification of hot water washing-treated steam-exploded rice husk to ethanol. We report here the efficient production of bioethanol using steam-exploded rice husk.
Graduate School of Life Sciences, Toyo University, 1-1-1 Izumino, Itakura-machi, Ora-gun, Gunma, 374-0193, Japan.
Takamitsu
T
Tabata
Graduate School of Life Sciences, Toyo University, 1-1-1 Izumino, Itakura-machi, Ora-gun, Gunma, 374-0193, Japan.
Yusuke
Y
Yoshiba
Graduate School of Life Sciences, Toyo University, 1-1-1 Izumino, Itakura-machi, Ora-gun, Gunma, 374-0193, Japan.
Tomonori
T
Takashina
Frontier Foods Co. Ltd., 3-3-2 Kandaogawa-machi, Chiyoda-ku, Tokyo, 101-0052, Japan.
Kazuo
K
Hieda
Graduate School of Life Sciences, Toyo University, 1-1-1 Izumino, Itakura-machi, Ora-gun, Gunma, 374-0193, Japan. shimizu@toyo.jp.|Bio-Nano Electronics Research Center, Toyo University, 2100 Kujirai, Kawagoe-shi, Saitama, 350-8585, Japan. shimizu@toyo.jp.
Norio
http://orcid.org/0000-0002-6225-233X
N
Shimizu
D056804:Biofuels; D018533:Biomass; D001709:Biotechnology / Q000379:methods*; D050260:Carbohydrate Metabolism; D002480:Cellulase / Q000378:metabolism; D004926:Escherichia coli / Q000201:enzymology / Q000235:genetics / Q000378:metabolism*; D000431:Ethanol / Q000378:metabolism*; D005285:Fermentation; D005947:Glucose / Q000378:metabolism; D006868:Hydrolysis; D008031:Lignin / Q000378:metabolism; D012275:Oryza / Q000737:chemistry* / Q000378:metabolism / Q000382:microbiology*; D011134:Polysaccharides / Q000378:metabolism*; D011994:Recombinant Proteins / Q000378:metabolism; D013227:Steam
D056804:Biofuels; D011134:Polysaccharides; D011994:Recombinant Proteins; D013227:Steam; C036909:lignocellulose; D000431:Ethanol; C007916:hemicellulose; D008031:Lignin; D002480:Cellulase; D005947:Glucose
Bioethanol; Escherichia coli KO11; Inhibition; Rice husk; Steam explosion