PREPARATION AND STRUCTURAL CHARACTERIZATION OF HEMICELLULOSES FROM TAMARIXAUSTROMONGOLICA (TAMARIXSPP.) THROUGH ORGANIC SOLVENTS AND ALKALINE SOLUTIONS
Lignocellulose has received increasing attention recent years for renewable fuels and chemicals due to environmental issues and energy crisis. A critical step in utilization is to obtain the hemicellulosic sugars from various lignocellulosic materials. In this study, three organosolv and three alkaline hemicellulosic fractions were prepared from the fastgrowing lignocellulosic biomass Tamarix austromongolica (TA). Comparative study showed that the organosolv-soluble fractions contained a higher content of glucose and arabinose, and a lower content of xylose than the hemicellulosic fractions isolated with aqueous alkaline solutions. The results supported a major structure based on a linear polymer of β-(l→4)-linked D-xylopyranosyl residues, having branches of a-L-Araf and 4-O-methyl-D-glucuronic acid residues monosubstituted at 0-3 and 0-2, respectively. The molar ratios of D-xylose, 4-Omethyl-D-glucuronic acid, and arabinose varied, and were estimated to be 14:1:1 and 7:2:1, respectively, for the DMSO-soluble fraction and the 0.5％ alkaline EtOH-soluble fraction, and 1％ KOH-extracted fraction gave a value of D-xylose/4-(9-methyl-D-glucuronic acid 18:1. It was found that one stage of major mass loss occurred between 200-400 °C, which mainly devolatilized with total volatile yield of about 55％.
lignocellulosic biomass Tamarix austromongolica hemicelluloses structure feature thermal stability
Yong C. Sun Jia L. Wen Feng Xu Run C.Sun
Institute ofBiomass Chemistry and Technology, Beijing Forestry University, Beijing 100083, China Institute ofBiomass Chemistry and Technology, Beijing Forestry University, Beijing 100083, China Sta
国际会议
16th International Symposium on Wood,Fiber and Pulping Chemistry(第十六届木材、纤维及制浆化学国际会议)
天津
英文
949-954
2011-06-08（万方平台首次上网日期，不代表论文的发表时间）