title: Integrated Production of Xylonic Acid and Bioethanol from Acid-Catalyzed Steam-Exploded Corn Stover.
abstract: High-efficiency xylose utilization is one of the restrictive factors of bioethanol industrialization. However, xylonic acid (XA) as a new bio-based platform chemical can be produced by oxidation of xylose with microbial. So, an applicable technology of XA bioconversion was integrated into the process of bioethanol production. After corn stover was pretreated with acid-catalyzed steam-explosion, solid and liquid fractions were obtained. The liquid fraction, also named as acid-catalyzed steam-exploded corn stover (ASC) prehydrolyzate (mainly containing xylose), was catalyzed with Gluconobacter oxydans NL71 to prepare XA. After 72 h of bioconversion of concentrated ASC prehydrolyzate (containing 55.0 g/L of xylose), the XA concentration reached a peak value of 54.97 g/L, the sugar utilization ratio and XA yield were 94.08 and 95.45 %, respectively. The solid fraction was hydrolyzed to produce glucose with cellulase and then fermented with Saccharomyces cerevisiae NL22 to produce ethanol. After 18 h of fermentation of concentrated enzymatic hydrolyzate (containing 86.22 g/L of glucose), the ethanol concentration reached its highest value of 41.48 g/L, the sugar utilization ratio and ethanol yield were 98.72 and 95.25 %, respectively. The mass balance showed that 1 t ethanol and 1.3 t XA were produced from 7.8 t oven dry corn stover.
authors.affiliation: College of Chemical Engineering, Nanjing Forestry University, Nanjing, 210037, China, zhujj@njfu.edu.cn.
authors.forename: Junjun
authors.initials: J
authors.lastname: Zhu
authors.forename: Yayun
authors.initials: Y
authors.lastname: Rong
authors.forename: Jinlong
authors.initials: J
authors.lastname: Yang
authors.forename: Xin
authors.initials: X
authors.lastname: Zhou
authors.forename: Yong
authors.initials: Y
authors.lastname: Xu
authors.forename: Lingling
authors.initials: L
authors.lastname: Zhang
authors.forename: Jiahui
authors.initials: J
authors.lastname: Chen
authors.forename: Qiang
authors.initials: Q
authors.lastname: Yong
authors.forename: Shiyuan
authors.initials: S
authors.lastname: Yu
mesh_terms: D056804:Biofuels; D002384:Catalysis / Q000187:drug effects; D002480:Cellulase / Q000378:metabolism; D000431:Ethanol / Q000378:metabolism*; D005285:Fermentation / Q000187:drug effects; D006868:Hydrolysis; D012441:Saccharomyces cerevisiae / Q000187:drug effects / Q000378:metabolism; D013227:Steam; D013400:Sugar Acids / Q000378:metabolism*; D013464:Sulfuric Acids / Q000494:pharmacology*; D014866:Waste Products; D003313:Zea mays / Q000187:drug effects / Q000378:metabolism*
chemical_list: D056804:Biofuels; D013227:Steam; D013400:Sugar Acids; D013464:Sulfuric Acids; D014866:Waste Products; D000431:Ethanol; D002480:Cellulase; C033158:sulfuric acid