title: Effects of acid impregnated steam explosion process on xylose recovery and enzymatic conversion of cellulose in corncob.
abstract: Corncob residue is a cellulose-rich byproduct obtained from industrial xylose production via dilute acid hydrolysis processes. Enzymatic hydrolysis of cellulose in acid hydrolysis residue of corncob (AHRC) is often less efficient without further pretreatment. In this work, the process characteristics of acid impregnated steam explosion were studied in conjunction with a dilute acid process, and their effects on physiochemical changes and enzymatic saccharification of corncob residue were compared. With the acid impregnated steam explosion process, both higher xylose recovery and higher cellulose conversion were obtained. The maximum conversion of cellulose in acid impregnated steam explosion residue of corncob (ASERC) reached 85.3%, which was 1.6 times higher than that of AHRC. Biomass compositional analysis showed similar cellulose and lignin content in ASERC and AHRC. XRD analysis demonstrated comparable crystallinity of ASERC and AHRC. The improved enzymatic hydrolysis efficiency was attributed to higher porosity in ASERC, measured by mercury porosimetry.
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, PR China.
authors.forename: Xiaoguang
authors.initials: X
authors.lastname: Fan
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, PR China.
authors.forename: Gang
authors.initials: G
authors.lastname: Cheng
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, PR China.
authors.forename: Hongjia
authors.initials: H
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, PR China.
authors.forename: Menghua
authors.initials: M
authors.lastname: Li
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, PR China.
authors.forename: Shizeng
authors.initials: S
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, PR China. Electronic address: yuanqp@mail.buct.edu.cn.
authors.forename: Qipeng
authors.initials: Q
authors.lastname: Yuan
mesh_terms: D002482:Cellulose / Q000032:analysis* / Q000378:metabolism; D006868:Hydrolysis; D013227:Steam; D013464:Sulfuric Acids / Q000737:chemistry; D014961:X-Ray Diffraction / Q000379:methods; D014994:Xylose / Q000032:analysis*; D003313:Zea mays / Q000201:enzymology*
chemical_list: D013227:Steam; D013464:Sulfuric Acids; D002482:Cellulose; D014994:Xylose
keywords: Acid impregnation; Corncob residue; Enzymatic hydrolysis; Steam explosion