COMPARATIVE STUDY OF ORGANOSOLV AND ALKALINE HEMICELLULOSES FROM ULTRASONIC IRRADIATED FAST-GROWING POPLAR WOOD
One organic and three alkaline hemicellulosic fractions were isolated from ultrasonic irradiated organosolv partially delignified fast-growing poplar wood by successive treatments with dimethyl sulfoxide under ultrasonic irradiation at 570 W, 25 oC for 30min, 70％ ethanol containing 1％ NaOH, 3％ NaOH and 6％ NaOH at 75 oC for 3 h, respectively. The four hemicellulosic fractions obtained were comparatively studied by sugar analysis, alkaline nitrobenzene oxidation of the bound lignin, GPC, FT-IR, 1D and 2D NMR spectroscopy. The results showed that the ultrasonic treatment and sequential extractions with alkali under the conditions given led to a release of 75.5％ of the original hemicelluloses, while the yield of hemicelluloses extracted with DMSO under ultrasound irradiation was low, and its macromolecular was more branching and showed a lower degree of polymerization as compared with the three alkaline hemicellulosic fractions. Moreover, all the four hemicellulosic fractions contained relatively low amounts of associated lignin, ranging between 0.96 and 3.10％.
poplar wood hemicelluloses HSQC ultrasonic
Yuan Tongqi He Jing Xu Feng Sun Runcang
Institute of Biomass Chemistry and Technology,Beijing Forestry University, 100083, Beijing, China Institute of Biomass Chemistry and Technology,Beijing Forestry University, 100083, Beijing, China St
国际会议
广州
英文
97-100
2010-11-08（万方平台首次上网日期，不代表论文的发表时间）