title: Improvement of the enzymatic hydrolysis of furfural residues by pretreatment with combined green liquor and ethanol organosolv.
abstract: Furfural residues (FRs) were pretreated with ethanol and a green liquor (GL) catalyst to produce fermentable sugar. Anthraquinone (AQ) was used as an auxiliary reagent to improve delignification and reduce cellulose decomposition. The results showed that 42.7% of lignin was removed and 96.5% of cellulose was recovered from substrates pretreated with 1.0 mL GL/g of dry substrate and 0.4% (w/w) AQ at 140°C for 1h. Compared with raw material, ethanol-GL pretreatment of FRs increased the glucose yield from 69.0% to 85.9% after 96 h hydrolysis with 18 FPU/g-cellulose for cellulase, 27 CBU/g-cellulose for β-glucosidase. The Brauner-Emmett-Teller surface area was reduced during pretreatment, which did not inhibit the enzymatic hydrolysis. Owing to the reduced surface area, the unproductive binding of cellulase to lignin was decreased, thus improving the enzymatic hydrolysis. The degree of polymerization of cellulose from FRs was too low to be a key factor for improving enzymatic hydrolysis.
authors: Department of Chemistry and Chemical Engineering, Beijing Forestry University, Beijing, China.
authors: Hailong
authors: H
authors: Yu
authors: Department of Chemistry and Chemical Engineering, Beijing Forestry University, Beijing, China.
authors: Yang
authors: Y
authors: Xing
authors: GuangXi Key Laboratory of Chemistry and Engineering of Forest Products, Nanning 530006, China.
authors: Fuhou
authors: F
authors: Lei
authors: Chunlei Industrial Group Company, Xingtai 054001, China.
authors: Zhiping
authors: Z
authors: Liu
authors: GuangXi Key Laboratory of Chemistry and Engineering of Forest Products, Nanning 530006, China.
authors: Zuguang
authors: Z
authors: Liu
authors: Department of Chemistry and Chemical Engineering, Beijing Forestry University, Beijing, China. Electronic address: jiangjx@bjfu.edu.cn.
authors: Jianxin
authors: J
authors: Jiang
mesh_terms: D000327:Adsorption; D000468:Alkalies / Q000494:pharmacology*; D000880:Anthraquinones / Q000494:pharmacology; D001709:Biotechnology / Q000379:methods*; D002480:Cellulase / Q000378:metabolism*; D002482:Cellulose / Q000302:isolation & purification; D000431:Ethanol / Q000494:pharmacology*; D005662:Furaldehyde / Q000378:metabolism*; D005947:Glucose / Q000378:metabolism; D006868:Hydrolysis / Q000187:drug effects; D058105:Polymerization; D012997:Solvents / Q000494:pharmacology*
chemical_list: D000468:Alkalies; D000880:Anthraquinones; D012997:Solvents; D000431:Ethanol; D002482:Cellulose; D005662:Furaldehyde; D002480:Cellulase; D005947:Glucose
keywords: Brauner–Emmett–Teller surface area; Cellulase adsorption; Enzymatic hydrolysis; Furfural residues; Green liquor