title: Novel pretreatment of steam explosion associated with ammonium chloride preimpregnation.
abstract: Improving nitrogen content and enhancing enzymatic hydrolysis are key processes involved in cellulosic ethanol production. Steam explosion (SE) associated with NH4Cl preimpregnation was carried out to investigate effects of the pretreatment on nitrogen content, enzymatic digestibility, and ethanol production. Results showed that nitrogen content in pretreated samples increased, which can be used as nitrogen resource for ethanol fermentation. The highest glucose yield of sample pretreated by 1.4MPa SE with 90g/l NH4Cl preimpregnation was 62.64%, which was 2.1 and 0.2 times higher than that of untreated sample and 1.4MPa SE pretreated sample, respectively. Ethanol yield of sample pretreated by 1.1MPa SE with 135g/l NH4Cl preimpregnation resulted in 1.93 and 0.69 times higher than that of untreated sample and 1.1MPa SE pretreated sample, respectively. This novel pretreatment improved nitrogen content and enhanced enzymatic digestibility under mild conditions, and could be recommended to further industrial application.
authors.affiliation: State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China. Electronic address: hzchen@home.ipe.ac.cn.
authors.forename: Hongzhang
authors.initials: H
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Guanhua
authors.initials: G
authors.lastname: Li
authors.affiliation: State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Hongqiang
authors.initials: H
authors.lastname: Li
mesh_terms: D000643:Ammonium Chloride / Q000494:pharmacology*; D001709:Biotechnology / Q000379:methods*; D050260:Carbohydrate Metabolism / Q000187:drug effects; D002480:Cellulase / Q000378:metabolism; D000431:Ethanol / Q000378:metabolism; D005285:Fermentation / Q000187:drug effects; D006868:Hydrolysis / Q000187:drug effects; D009584:Nitrogen / Q000032:analysis; D012275:Oryza / Q000187:drug effects; D011134:Polysaccharides / Q000378:metabolism; D013227:Steam; D014866:Waste Products
chemical_list: D011134:Polysaccharides; D013227:Steam; D014866:Waste Products; D000643:Ammonium Chloride; D000431:Ethanol; C007916:hemicellulose; D002480:Cellulase; D009584:Nitrogen
keywords: Ammonium chloride preimpregnation; Biomass; Enzymatic digestibility; Ethanol; SE; SERS; Steam explosion; URS; steam explosion; steam-exploded rice straw; untreated rice straw