FRACTIONAL EXTRACTION AND STRUCTURAL CHARACTERIZATION OF HEMICELLULOSES FROM PARTIALLY DELIGNIFIED HYBRID POPLAR
In this study, ball milled hybrid poplar was partially delignified using dimethyl sulfoxide/lithium chloride (DMSO/LiCl) system based on LiCl to poplar weight ratio of 0.3:1, 0.4:1, 0.5:1, 0.6:1, 0.7:1, and 0.8:1, respectively. The chemical composition and structural features of six hemicellulosic preparations, released during the subsequent treatment with dimethyl sulfoxide (DMSO), were elucidated by combination of sugar analysis, Fourier transform infrared (FT-IR), 1H, 13C and 2D HSQC NMR spectroscopy. The result showed that xylans were the predominant components in the hemicelluloses, while glucan, mannan and glucuronic acid acted as the minor components. Further studies by 1H, 13C and 2D-HSQC NMR revealed that the hemicellulosic preparation based on LiCl to poplar weight ratio of 0.3:1 contained a partially O-acetylated 4-O-methylglucuronoxylan and linear β-(1→4)-linked glucomannan.
hemicelluloses poplar dimethyl sulfoxide 2D HSQC NMR
Meng Lingyan Zhang Xueming Wu Yuying Xu Feng Sun Runcang
Institute of Biomass Chemistry and Technology,Beijing Forestry University, Beijing, 00083, China Institute of Biomass Chemistry and Technology, Beijing Forestry University, Beijing, 00083, China St
国际会议
广州
英文
248-251
2010-11-08（万方平台首次上网日期，不代表论文的发表时间）