Structural Changes of Poplar Wood Lignin in Hydrothermal pretreatment in Acetic Acid-Sodium Acetate system  

作　　者：Quanshui Yu Yingjuan Fu Zhiyong Shao Fengshan Zhang Menghua Qin 

机构地区：[1]Key Laboratory of Pulp&Paper Science and Technology of the Ministry of Education,Qilu University of Technology,Jinan 250353,Shandong,China [2]Huatai Group Corp.Ltd.,Dongying,Shandong,257335,China [3]Organic Chemistry Laboratory,Taishan University,Taian 271021,Shandong,China

出　　处：《Journal of Bioresources and Bioproducts》2017年第4期158-162,共5页生物质资源与工程（英文）

基　　金：support from the National Natural Science Foundation of China (31540009 and 31370581);the Yellow River Mouth Scholar Program (DYRC20120105).

摘　　要：Hydrothermal pretreatment of poplar wood chips was performed in an acetic acid/sodium acetate buffer medium.To characterize the structural changes of lignin in the pretreatment process,milled wood lignin(MWL)was isolated from both the un-treated and treated poplar wood chips,and analyzed by ^(1)H-NMR,^(13)C-NMR,^(31)P-NMR,FT-IR,and GPC-MALLS.Results showed that the lignin in the pretreated wood chips had more phenolic OH groups,less aliphatic OH groups,higher molecular weight,and narrower polydispersity,in comparison with the lignin in the un-treated wood.The acetic acid-sodium acetate buffer pretreatment facilitated the removal of-OCH_(3) groups and the cleavage of the inter-unit linkages ofβ-O-4 bond in the lignin.Furthermore,the re-polymerization of lignin in the acetic acid-sodium acetate buffer pretreatment was found to be less than that in autohydrolysis.

关 键 词：Poplar wood Acetic acid/sodium acetate buffer pretreatment Lignin structure Repolymerization reaction 

分 类 号：O62[理学—有机化学]