title: Influence of lignin addition on the enzymatic digestibility of pretreated lignocellulosic biomasses.
abstract: The presence of lignin in lignocellulosic biomass is correlated with its enzymatic digestibility. Their correlation and mechanism have been investigated widely but have not been elucidated clearly. In this study, hydrophilic sulfonated lignin and hydrophobic kraft lignin were introduced into the enzymatic hydrolysis process to investigate their effects on the enzymatic digestibility of different pretreated lignocellulose. The influence of lignin addition on the enzymatic digestibility varied with both introduced lignin type and the pretreatment methods of substrates. Slight enhancement of enzymatic hydrolysis was observed for all substrates by adding kraft lignin. The addition of sulfonated lignin could effectively improve the enzymatic digestibility of green liquor and acidic bisulfite pretreated materials, but had little effect on sulfite-formaldehyde pretreated samples. The enzymatic digestibility of green liquor pretreated masson pine increased from 42% without lignin addition to 75% with 0.3g/g-substrate sulfonated lignin addition.
authors.affiliation: Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China.
authors.forename: Wangxia
authors.initials: W
authors.lastname: Wang
authors.affiliation: Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China.
authors.forename: Yangsu
authors.initials: Y
authors.lastname: Zhu
authors.affiliation: Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Du
authors.affiliation: Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China.
authors.forename: Yiqin
authors.initials: Y
authors.lastname: Yang
authors.affiliation: Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China. Electronic address: jinyongcan@njfu.edu.cn.
authors.forename: Yongcan
authors.initials: Y
authors.lastname: Jin
mesh_terms: D018533:Biomass; D002480:Cellulase / Q000378:metabolism*; D005557:Formaldehyde / Q000494:pharmacology; D008031:Lignin / Q000378:metabolism / Q000494:pharmacology*; D008970:Molecular Weight; D032107:Populus / Q000187:drug effects; D013447:Sulfites / Q000494:pharmacology
chemical_list: D013447:Sulfites; C036909:lignocellulose; D005557:Formaldehyde; C076151:Kraft lignin; D008031:Lignin; D002480:Cellulase; C042345:hydrogen sulfite
keywords: Enzymatic digestibility; Kraft lignin; Lignocellulosic biomass; Pretreatment; Sulfonated lignin