title: Effect of dimethyl sulfoxide on ionic liquid 1-ethyl-3-methylimidazolium acetate pretreatment of eucalyptus wood for enzymatic hydrolysis.
abstract: Ground eucalyptus wood was pretreated with 1-ethyl-3-methylimidazolium acetate ([EMIM]OAc)-dimethyl sulfoxide (DMSO) solutions with different mixing ratios under various conditions. The changes in the composition and structure of the biomass were investigated; and the enzymatic hydrolysis performance of the pretreated biomass was evaluated. [EMIM]OAc-DMSO pretreatment had a relatively mild effect on the composition of the biomass, but excessively high pretreatment temperatures led to massive loss of xylan after pretreatment. The enzymatic digestibility of the biomass was significantly improved with increased pretreatment temperature. X-ray diffraction analysis revealed that the disruption of cellulose crystal structure by [EMIM]OAc at a sufficiently high temperature was primarily responsible for the remarkable improvement in the digestibility. Appropriate addition of DMSO could help minimize the consumption of [EMIM]OAc without impairing the performance of the ionic liquid, and contribute to the improvement in pretreatment efficiency due to the viscosity reduction effect on the pretreatment liquor.
authors.affiliation: Biomass Refinery Research Center, National Institute of Advanced Industrial Science and Technology, 3-11-32 Kagamiyama, Higashihiroshima, Hiroshima 739-0046, Japan.
authors.forename: Long
authors.initials: L
authors.lastname: Wu
authors.forename: Seung-Hwan
authors.initials: SH
authors.lastname: Lee
authors.forename: Takashi
authors.initials: T
authors.lastname: Endo
mesh_terms: D018533:Biomass; D002480:Cellulase / Q000378:metabolism*; D004121:Dimethyl Sulfoxide / Q000494:pharmacology*; D005052:Eucalyptus / Q000187:drug effects*; D005947:Glucose / Q000096:biosynthesis; D006868:Hydrolysis / Q000187:drug effects; D007093:Imidazoles / Q000494:pharmacology*; D052578:Ionic Liquids / Q000494:pharmacology*; D012996:Solutions; D013696:Temperature; D013997:Time Factors; D014783:Viscosity / Q000187:drug effects; D014934:Wood / Q000187:drug effects*; D014961:X-Ray Diffraction; D014994:Xylose / Q000096:biosynthesis
chemical_list: D007093:Imidazoles; D052578:Ionic Liquids; D012996:Solutions; D014994:Xylose; D002480:Cellulase; D005947:Glucose; C518739:1-ethyl-3-methylimidazolium; D004121:Dimethyl Sulfoxide