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Because of high contents of cellulose and hemicellulose, barley straw seems to be a potential lignocellulosic biomass for production of bioethanol. Ethanosolv applied organosolv pretreatment is more convenient method than other pretreatment. However, sulfuric acid was used as a catalyst in the ethanosolv pretreatment. The acid catalyzed treatment might have some undesirable effects such as the formation of inhibitor(furfural, HMF) and corrosion of the reaction vessels. To avoid these side effects, FeCl3 substituted for sulfuric acid. FeCl3 is less corrosive than acid and can be recycled, it is more economically. In this study, we evaluate the effects of various inorganic salts on enzymatic digestibility to select a appropriate one and investigated the effects of FeCl3 concentration and temperature on enzymatic digestibility. To confirm side effect caused FeCl3, using FeCl3 evaluate the formation of inhibitor(HMF, furfural) compared to sulfuric acid and remained FeCl3 was investigated after ethanosolv. 1. NGUYEN, Quang (2009) Dilute
aicd/metal salt hydrolysis of lignocellulosics. European patent , WO 2002/012529.2. Liu, L., Sun, J. Corn stover pretreatment by inorganic salts and its effects on hemicelluloses and cellulose degradation. Bioresour. Technol. 100:5865-5871 (2009).