Comparison of the substrate enzymatic digestibility and lignin structure of wheat straw stems and leaves pretreated by green liquor.
In this work, the substrate enzymatic digestibility (SED) and the lignin structure of green liquor (GL) pretreated wheat straw stems and leaves were investigated. Compared with wheat straw stems, leaves showed higher delignification selectivity in GL pretreatment and higher SED in enzymatic hydrolysis. Wet chemical analysis indicated that, characterized with lower content of syringyl units and less β-O-4 linkages, leaf lignin is structurally different from stem lignin. After GL pretreatment, the drops of both nitrobenzene oxidation and ozonation products yield of leaves were obviously higher than those of stems, which means that more β-O-4 linkages of leaf lignin were broken than that of stem lignin. The SED of total sugar in GL-pretreated leaves was about 50% higher than that in GL-pretreated stems. The less content and lower S/G ratio of lignin are suggested to be the important factors for the better SED of GL-pretreated leaves.
Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China.
Bo
B
Jiang
Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China.
Wangxia
W
Wang
Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China.
Feng
F
Gu
Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China.
Tingyue
T
Cao
Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China. Electronic address: jinyongcan@njfu.edu.cn.
Yongcan
Y
Jin
D002480:Cellulase / Q000378:metabolism; D006868:Hydrolysis; D008031:Lignin / Q000737:chemistry*; D009578:Nitrobenzenes / Q000378:metabolism; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry; D018515:Plant Leaves / Q000737:chemistry*; D018547:Plant Stems / Q000737:chemistry*; D013379:Substrate Specificity; D014908:Triticum / Q000737:chemistry*; D014865:Waste Disposal, Fluid
D009578:Nitrobenzenes; D010126:Ozone; D008031:Lignin; C036077:nitrobenzene; D002480:Cellulase
Green liquor pretreatment; Lignin; Substrate enzymatic digestibility (SED); Wheat straw