Recycled ionic liquid 1-ethyl-3-methylimidazolium acetate pretreatment for enhancing enzymatic saccharification of softwood without cellulose regeneration |
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| Authors: | Umi Hamidah Takuya Arakawa Yin Ying H’ng Akiko Nakagawa-izumi Masanori Kishino |
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| Institution: | 1.Graduate School of Life and Environmental Sciences,University of Tsukuba,Tsukuba,Japan;2.Research Unit for Clean Technology,Indonesian Institute of Sciences (LIPI),Bandung,Indonesia;3.Forest Products Research Institute, Hokkaido Research Organization,Asahikawa,Japan |
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| Abstract: | In this work, pretreatment of wood meals using a recycled ionic liquid (IL), 1-ethyl-3-methylimidazolium acetate (Emim]Ac), enhanced glucose liberation by enzymatic saccharification, without dissolution of cellulose and lignin. In contrast, previous studies on IL pretreatment have mostly focused on lignocellulosic dissolution to regenerate cellulose and removing lignin. Softwood (Cryptomeria japonica) was pretreated with Emim]Ac at 60–100 °C for 2–8 h without collecting regenerated cellulose. The pretreatment did not have a strong effect on wood component dissolution (weight of residues: 91.7–98.8%). The residues contained relatively high amounts of lignin (26.6–32.6%) with low adsorption of Emim]Ac (0.9–2.7%). Meanwhile, the crystallinity index (C r I) of cellulose in the wood was significantly reduced by pretreatment, from 50.9% to 28.4–37.1%. In spite of the high lignin contents in the residues, their glucose liberation values by enzymatic saccharification using a cellulase mixture were 3–16 times greater than that of untreated wood. A good correlation was found between the saccharification effectiveness of pretreated samples and the C r I. Although lignin dissolved in Emim]Ac continued to accumulate after repeated use of Emim]Ac, the pretreatment was found to be effective for three consecutive cycles without the need to remove the dissolved materials. |
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