Fractionation and characterization of alkali-extracted hemicelluloses from peashrub

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• 作者：Feng Peng^a ; Jing Bian^b ; Jun-Li Ren^a ; Pai Peng^a ; Feng Xu^b ; ^{rcsun3@bjfu.edu.cn} ; ^{xfx315@bjfu.edu.cn} ; Run-Cang Sun^a ; ^b ;
• 关键词：C. korshinskyii ; Hemicelluloses ; Alkali ; Fractionation ; Iodine-complex precipitation
• 刊名：Biomass and Bioenergy
• 出版年：2012
• 期刊代码：3_09619534
• 类别：pw
• 出版时间：April, 2012
• 卷：39
• 期：Complete
• 页码：20-30
• 文件大小：1016 K

摘要

Alkali-soluble hemicelluloses were extracted from delignified peashrub (Caragana korshinskii) by sequential treatments with 0.5, 1.0 and 2.0聽mol聽L^鈭? KOH under a solid to liquid ratio of 1:25 (g聽mL^鈭?) at 25聽掳C for 10聽h. The successive treatments resulted in a total dissolution of 64.1, 15.6, and 12.5%of the original hemicelluloses, respectively. The released hemicelluloses were separated into linear and branched hemicellulosic subfractions by the iodine-complex precipitation technique. Their chemical and physical characteristics were determined by HPAEC, GPC, FT-IR and ¹H and ¹³C NMR spectroscopy. It was found that the hemicelluloses precipitated by iodine-potassium iodide solution were more linear as shown they contained more xylose and less uronic acid than the hemicelluloses remaining in the solution, which were more branched and contained higher amounts of arabinose, galactose and glucose. In addition, the linear hemicellulosic subfractions with a low arabinose/xylose ratio had higher molecular weights than those of the branched hemicellulosic subfractions in solution.