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Characterization of Hemicelluloses Extracted from Populus tomentosa Carr. by the Hydrothermal Method with Ethanol

查看全文 作　　者：LianHua [1]Fu;Shan [1]Liu;ShuMing [1]Li;YaYu [1]Li;MingGuo [1,2]Ma 高影响力作者 机构地区：[1]Engineering Research Center of Forestry Biomass Materials and Bioenergy,Beijing Key Laboratory of Lignocellulosic Chemistry,College of Materials Science and Technology,Beijing Forestry University;[2]Key Laboratory of Pulp and Paper Science & Technology of Ministry of Education,Qilu University of Technology高影响力机构 出　　处：《Paper And Biomaterials》索引2017年第2卷第3期,共11页高影响力期刊 基　　金：Financial support from the Foundation(No.KF201607)of the Key Laboratory of Pulp and Paper Science and Technology of the Ministry of Education/Shandong Province of China 摘　　要：The aim of this study was to investigate the hemicelluloses extracted from Populus tomentosa Carr.by the hydrothermal method with ethanol.The influence of ethanol concentration on the hemicellulosic fractions was systematically studied.The chemical compositions and structural features of the hemicellulosic fractions were investigated by a combination of sugar analysis,gel-permeation chromatography,Fourier transform infrared spectroscopy,and one-dimensional proton and carbon-13 nuclear magnetic resonance,and two-dimensional heteronuclear single quantum coherence spectroscopy.Neutral sugar analysis of the hemicellulosic fractions revealed that a higher ethanol concentration(45%~80%) favored the isolation of hemicelluloses with more side chains and lower glucose contents.The molecular weights of these polysaccharides ranged between 2842 g/mol and 5101 g/mol.The results of this study indicate that the hydrothermal ethanol process provides a new pretreatment strategy for the isolation and extraction of biomass. 关 键 词：hemicelluloses ISOLATION HYDROTHERMAL ETHANOL CHARACTERIZATION
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