Fractionation and Characterization of Hemicelluloses of Corn Stalk
In present work,the hemicelluloses were sequentially extracted and fractionated into types of H1–H6 hemicellulosic from delignified corn stalk using dimethyl sulfoxide(DMSO),dioxane-triethylamine(9∶1,v/v),saturated hydrogen barium oxide,1M KOH,1M NaOH and 3M KOH,respectively.The yields,sugars,uronic acid,structural and thermal properties of each fractions was analyzed by different analytical techniques(HPAEC,FT-IR,1H NMR,13C NMR and TGA).The results indicated that the solvent systems had a significant influence on the yield and structure of the fractionated hemicelluloses.The structure of hemicelluloses extracted with organic solvent had more branched,while the structure of alkali-soluble hemicelluloses was straight-chain.The hemicellulosic fraction isolated with DMSO appeared to be essentially linked in(1-4)β-D-xylan with 4-O-methyl-glucuronic acid and L-arabinose attached at branched chain.The TGA analysis showed that the thermal stability of alkali-soluble hemicellulose was better than that of the hemicelluloses extracted by organic solvent.Current fractionation and characterization strategies will be beneficial and valuable for further hemicellulose conversion and utilization.
Rui Li Guihua Yang Gaojin Lyu Jiachuan Chen Yuanyuan Xia
Key Lab of Paper Science and Technology of the Ministry of Education Qilu University of Technology Jinan,250353,P.R.China
国际会议
第五届制浆造纸新技术国际研讨会(ISETPP)暨第三届国际造纸与环境学术大会(IPEC)
广州
英文
1-4
2016-11-07（万方平台首次上网日期，不代表论文的发表时间）