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Physicochemical transformation of rice straw after pretreatment with a deep eutectic solvent of choline chloride/urea
- Pan, Mingzhu, Zhao, Guomin, Ding, Chunxiang, Wu, Bing, Lian, Zhina, Lian, Hailan
- Carbohydrate polymers 2017 v.176 pp. 307-314
- cellulose, chlorides, choline, crystal structure, enzymatic hydrolysis, fractionation, hemicellulose, lignin, rice straw, solubility, solubilization, solvents, temperature, urea
- This study focused on the pretreatment with deep eutectic solvent of choline chloride (ChCl)/urea mixtures on rice straw and its chemical fractions of holocellulose, α-cellulose, and acid-insoluble-lignin (AIL). The pretreatment of ChCl/urea was significantly affected by the treated temperature prior to the treated time, and 130°C and 4h was an optimum condition for ChCl/urea pretreatment. The separation capacity of ChCl/urea on the chemical fractions was in an order of AIL (22.87%)> hemicellulose and amorphous cellulose (16.71%)>α-cellulose (9.60%). ChCl/urea had a higher selective solubility on lignin. The solubility of the whole fractionation of rice straw affected by ChCl/urea was a combination of solubilization on cellulose, hemicellulose and lignin. ChCl/urea pretreatment increased crystallinity index (CrI) of rice straw residue and α-cellulose, while had no obvious influence on CrI of holocellulose. The effect of structural properties of rice straw residue on enzymatic hydrolysis was also explored.