Major improvement in the rate and yield of enzymatic saccharification of sugarcane bagasse via pretreatment with the ionic liquid 1-ethyl-3-methylimidazolium acetate ([Emim] [Ac])

作者：da Silva Ayla Sant'Ana; Lee Seung Hwan^*; Endo Takashi; Bon Elba P S

来源：Bioresource Technology, 2011, 102(22): 10505-10509.

DOI：10.1016/j.biortech.2011.08.085

• Sugarcane bagasse
• Ionic liquid pretreatment
• 1-Ethyl-3-methylimidazolium acetate
• Enzymatic saccharification

In this study, sugarcane bagasse was pretreated by six ionic liquids (ILs) using a bagasse/IL ratio of 1:20 (wt%). The solubilization of bagasse in the ILs was followed by water precipitation. On using 1-ethy1-3-methylimidazolium acetate [Emim] [Ac] at 120 degrees C for 120 min, 20.7% of the bagasse components remained dissolved and enzymatic saccharification experiments resulted on 80% glucose yield within 6 h, which evolved to over 90% within 24 h. Moreover, FE-SEM analysis of the precipitated material indicated a drastic lignin extraction and the exposure of nanoscopic cellulose microfibrils with widths of less than 100 nm. The specific surface area (SSA) of the pretreated bagasse (131.84 m(2)/g) was found to be 100 times that of untreated bagasse. The ability of [Emim] [Ac] to simultaneously increase the SSA and to decrease the biomass crystallinity is responsible for the improved bagasse enzymatic saccharification rates and yields obtained in this work.

• 出版日期2011-11