Synergistic effect of pretreatment with dimethyl sulfoxide and an ionic liquid on enzymatic digestibility of white poplar and pine

Abstract

A systematic study on the interactions between dimethyl sulfoxide (DMSO) and an ionic liquid (IL), 1-ethyl-3-methylimidazolium acetate (EmimAc), during lignocellulosic biomass pretreatment was performed. In this work, the ratio of biomass to EmimAc was fixed at 5 and 10 wt% while different amounts of DMSO were added to EmimAc: 0, 14, 32, 58, 72, 90, 95 and 100 wt%. This enabled a mechanistic understanding of the role of DMSO in IL pretreatment. While enhanced cellulose dissolution upon addition of DMSO was suggested by the XRD data, significantly higher concentrations of DMSO however retarded cellulose dissolution. The effects of DMSO on biomass pretreatment were discussed. Importantly, total sugar conversion of pretreated biomass samples showed a dependence on DMSO concentration, demonstrating the feasibility of using high concentrations of DMSO for efficient biomass pretreatment.This dependence was correlated with cellulose I lattice distortion or transformation during biomass pretreatment. Insights into the interactions between DMSO, EmimAc and biomass were revealed.

Deconstruction of corncob by steam explosion pretreatment: Correlations between sugar conversion and recalcitrant structures

“…The larger particles were used for steam explosion pretreatment and the smaller particles were used for chemical composition analysis of raw corncob. This size range used for compositional analysis has been adapted to enable better control over biomass compositions and comparisons between various experiments conducted in this laboratory (Zhang, Wang, Zhang, Zhang, Liu & Cheng, 2014;Zhang et al, 2015;Zhang, Zhao, Li, Li, Yuan & Cheng, 2016).…”

Manufacture of Platform Chemicals from Pine Wood Polysaccharides in Media Containing Acidic Ionic Liquids

“…Alkyl-imidazolium ionic liquids have been employed for processing pine wood (or fractions derived from its processing) in the field of biorefineries, acting as reaction media and/or catalysts. In general, aprotic imidazolium ionic liquids have been employed to process pine wood, eventually in the presence or absence of catalysts and co-solvents, to achieve a number of effects, including cellulose dissolution/regeneration and/or production of substrates susceptible to enzymatic hydrolysis, or hydrolysis-dehydration of polysaccharides [ 10 , 13 , 46 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 ].…”

A Review on the Partial and Complete Dissolution and Fractionation of Wood and Lignocelluloses Using Imidazolium Ionic Liquids

“…The most commonly used ionic liquids for wood disintegration were [124]. In a few cases, DMSO was added to support further wood disintegration [125][126][127]. In some studies, aqueous solutions of ionic liquids were used to disintegrate wood by targeting the hemicelluloses as they are crucial for wood disintegration [58,128,129].…”