title: pH pre-corrected liquid hot water pretreatment on corn stover with high hemicellulose recovery and low inhibitors formation.
abstract: A challenge for lignocellulosic pretreatment is how to retain hemicellulose as much as possible. To reduce the degradation of hemicellulose and increase the recovery of sugars, an effective pH pre-corrected liquid hot water pretreatment (LHWP) was developed by employing a small amount of NaOH (⩽5/100g substrate) to accelerate the hemicellulose deacetylation and simultaneously pre-correct the acid hydrolyzate in situ. The results showed that the pH pre-correction can control the hydrolyzate pH. Under the pretreatment severity (PS) of 4.0, the pH pre-corrected LHWP reduced the hemicellulose degradation by 35.3-92.3%, decreased furfural formation by 90.5-99.8%. The highest hemicellulose recovery of 96.38% was obtained with pH pre-corrected by 2g NaOH/100g substrate. Enzymatic hydrolysis (EH) and simultaneous saccharification and fermentation (SSF) on the whole slurry from the pH pre-corrected LHWP showed that the hemicellulose retained in the solid residue did not bring significant resistance to cellulose EH (p=0.837).
authors.affiliation: National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
authors.forename: Hong-Qiang
authors.initials: HQ
authors.lastname: Li
authors.affiliation: National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
authors.forename: Wei
authors.initials: W
authors.lastname: Jiang
authors.affiliation: Chinese Academy of Agricultural Mechanization Sciences MENOBLE Co., Ltd., Beijing 100083, People's Republic of China.
authors.forename: Jing-Xia
authors.initials: JX
authors.lastname: Jia
authors.affiliation: National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, People's Republic of China. Electronic address: jxu@home.ipe.ac.cn.
authors.forename: Jian
authors.initials: J
authors.lastname: Xu
mesh_terms: D050260:Carbohydrate Metabolism / Q000187:drug effects; D002480:Cellulase / Q000378:metabolism; D005285:Fermentation / Q000187:drug effects; D005662:Furaldehyde / Q000032:analysis; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration / Q000187:drug effects; D006868:Hydrolysis / Q000187:drug effects; D008031:Lignin / Q000032:analysis; D010636:Phenols / Q000032:analysis; D011134:Polysaccharides / Q000302:isolation & purification*; D012995:Solubility; D017550:Spectroscopy, Fourier Transform Infrared; D014866:Waste Products; D014867:Water / Q000494:pharmacology*; D003313:Zea mays / Q000737:chemistry* / Q000187:drug effects / Q000648:ultrastructure
chemical_list: D010636:Phenols; D011134:Polysaccharides; D014866:Waste Products; D014867:Water; C007916:hemicellulose; D008031:Lignin; D005662:Furaldehyde; D002480:Cellulase
keywords: Acetyl group; Furfural; Hemicellulose; Oligosaccharide; pH pre-corrected liquid hot water pretreatment