title: Enhancement in the enzymatic digestibility of hybrid poplar with poor residual hemicelluloses after Na2SO3 pretreatment.
abstract: The aim of this work was to illustrate the contributions of delignification and the introduced sulfonic groups on the enzymatic digestibility of the Na2SO3-pretreated hybrid poplar with poor residual hemicelluloses (HPPRH). The higher the content of the introduced sulfonic group in the pretreated HPPRH was, the higher its enzymatic digestibility could be achieved. Delignification was favorable to increasing the content of sulfonic group in the pretreated HPPRH. The introduced sulfonic group contributed much more to the total glucose yield at low level of residual lignin. The introduced sulfonic groups could contribute 17.30% of total glucose yield (92.70%) and delignification could do 38.43% of it. Meanwhile, the delignification rate and the sulfonic group content in the pretreated HPRH were 59.88% and 283.51mmolkg(-1) lignin, respectively. Therefore, the sulfonic group introduced on the pretreated lignocellulosics could improve the enzymatic digestibility and make the sulfite process effective.
authors.affiliation: College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China. Electronic address: jianghua@njfu.com.cn.
authors.forename: Hua
authors.initials: H
authors.lastname: Jiang
authors.affiliation: College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China.
authors.forename: Binbin
authors.initials: B
authors.lastname: Han
authors.affiliation: College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China.
authors.forename: Jianhong
authors.initials: J
authors.lastname: Ge
mesh_terms: D004798:Enzymes / Q000737:chemistry; D006868:Hydrolysis; D008031:Lignin / Q000737:chemistry; D056951:Photoelectron Spectroscopy; D011134:Polysaccharides / Q000737:chemistry*; D032107:Populus / Q000737:chemistry* / Q000378:metabolism*; D017550:Spectroscopy, Fourier Transform Infrared; D013447:Sulfites / Q000737:chemistry*; D013451:Sulfonic Acids / Q000032:analysis / Q000737:chemistry; D013696:Temperature
chemical_list: D004798:Enzymes; D011134:Polysaccharides; D013447:Sulfites; D013451:Sulfonic Acids; C007916:hemicellulose; D008031:Lignin; C025026:sodium sulfite
keywords: Enzymatic digestibility; Hybrid poplar; Sodium sulfite pretreatment; Sulfonic group