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영어

The bioethanol for use as a liquid fuel by a yeast fermentation of renewable biomass as an alternative to petroleum is important from the viewpoint of global environmental protection. Recently, many scientists have attempted to increase the productivity of bioethanol process by optimizing the liquefaction, saccharification and fermentation conditions. In this study, optimal conditions of temperature, time and enzyme concentration in liquefaction, which is an important stage in bioethanol production, were investigated. Various materials including cassava, brown rice, barley, sweet potato and corn were used. According to the results, the optimal conditions for liquefaction involving cassava are 95℃, 2h, 0.08% enzyme. The corresponding results for brown rice are 100℃, 1h, 0.08% enzyme; 95℃, 1h, 0.08% enzyme for barley; 95℃, 2h, 0.06% enzyme for sweet potato and 100℃, 2h, 0.06% enzyme for corn. Additionally, Field Emission Scanning Electron Microscopy results showed significant changes of starch structure during the liquefaction process. However, further studies are necessary to provide optimum operational conditions in order to increase the efficiency of bioethanol production.