Boosting the fermentable sugar yield and concentration of corn stover by magnesium oxide pretreatment for ethanol production. (December 2018)

• Record Type: Journal Article
• Authors: Li, Jun; Li, Wentao; Zhang, Meng; Wang, Donghai
• Is Part Of: Bioresource technology. Volume 269(2018)
• Page Start: 400
• Page End: 407
• Publication Date: 2018-12
• Subjects: Corn stover -- MgO -- Enzymatic hydrolysis -- Sugar yield -- SEM -- FTIR; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2018.08.102
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: MgO pretreatment causes double hemicellulose recovery compared to LHW (42 vs. 21%). Double xylan recovery doesn't affect glucose yield during enzymatic hydrolysis. Double xylan recovery increases xylose yield by 13% during enzymatic hydrolysis. MgO pretreatment increases the total sugar yield by 6% when compared with LHW. MgO-treated biomass slurry is neutral without furfural and HMF formation. Abstract: MgO pretreatment was investigated to boost the fermentable sugars derived from corn stover with LHW pretreatment as control. Compared to LHW pretreatment, MgO pretreatment caused twice hemicellulose recovery (42 vs 21%). Double hemicellulose recovery not only didn't affect glucose yield but increased xylose yield by 13% and total sugar yield by 6% under the optimal conditions (pretreatment: 10% biomass loading, 0.1 mol/L MgO, 190 °C, and 40 min; hydrolysis: pretreated biomass loading of 10 g/100 mL, enzyme loading of 1 mL/g pretreated biomass, 50 °C, and 120 h). A total sugar concentration of 50 g/L was obtained under the above conditions. Besides, the enzyme component hydrolyzing xylan may be prone to deactivation by lignin residues in pretreated biomass. Both SEM and FTIR analyses indicate that MgO effectively disrupted the biomass structures and enlarged the exposed surface area of carbohydrates, thus boosting the enzymatic hydrolysis and fermentable sugars for ethanol production.