Enhanced production and separation of short-chain glucan oligomers from corn stover in an unacidified LiBr molten salt hydrate via pre-extraction of hemicellulose

Abstract

Hemicellulose removal improves the production and separation efficiency of glucan oligomers from lignocellulose.

Metal Salt-Based Deep Eutectic Solvent Pretreatment of Moso Bamboo to Improve Enzymatic Hydrolysis

“…Gly as an organic solvent had a certain dissolution effect, hence the lignin content decreased slightly [20]. For a short-duration pretreatment (2 h) at a higher temperature (120 • C), the cellulose loss was only 9.02%, which was less than that (12.51%) of those observed following 3-h-long FeCl 3 /Gly pretreatment at 120 • C. This result suggested that long-duration pretreatment led to the removal of amorphous cellulose [21,22]. In addition, the influence of the pretreatment temperature on the fractionation of bamboo was stronger than that of the FeCl 3 /Gly pretreatment duration, which was consistent with the effect of ternary DES pretreatment at different temperatures and times [8,17].…”

Cascade fractionation of birch into xylose, glucan oligomers, and noncondensed lignin improved using microwave assistance and molten salt hydrates

“…21 Our previous work demonstrated that methanol can form stronger interactions with inorganic salts, thus breaking the link between glucan oligomers and salts and allowing glucan oligomers to precipitate out. 22 After thermofiltration, dissolved cellulose containing LiBr-MSH was hydrolyzed to obtain glucan oligomers, which could be precipitated by methanol from the LiBr-MSH solution. The distribution of glucose and glucan oligomers obtained from cellulose hydrolysis under 130 °C is illustrated in Fig.…”

Structure-Tunable Glucan Oligomer Production from Glucose and Disaccharide Glycosylation in an Unacidified LiBr·3.2H2O Molten Salt Hydrate

“…MSH is a special inorganic salt solvent with a water-to-salt molar ratio less than the coordination number of the cations. 21 We previously proved that an MSH of 60 wt % LiBr has weak Brønsted acidity, 22,23 which can potentially catalyze sugar glycosylation without adding any acid catalyst. Meanwhile, unsaturated coordinated cations can combine with the generated H 2 O from glucose/disaccharide glycosylation to inhibit the rehydrolysis of the formed glucan oligomers into glucose.…”

“…MSH is a special inorganic salt solvent with a water-to-salt molar ratio less than the coordination number of the cations . We previously proved that an MSH of 60 wt % LiBr has weak Brønsted acidity, , which can potentially catalyze sugar glycosylation without adding any acid catalyst.…”