FRACTIONAL ISOLATION AND STRUCTURAL CHARACTERIZATION OF HEMICELLULOSES FROM DENDROCALAMUS MEMBRANACEUS MUNRO

摘要：

The dewaxed cell walls of Dendrocalamus membranaceus Munro, which were treated with NaC102 and then sequentially with dimethyl sulfoxide, dioxanetriethylamine, 0.5 M, 1 M, 2 M and 3 M KOH, released 9.67, 1.67, 55.15, 12.52, 10.10, and 4.96％ of the original hemicelluloses, respectively. The successive treatment together resulted in the dissolution of 94.1％ of the original hemicelluloses in cell wall. The chemical and physical characteristics of hemicellulosic fractions were determined by HPAEC, GPC, FT-IR,1 H NMR and 13C NMR spectroscopies. The DMSO-soluble hemicellulosic fractions contained mainly xylose, arabinose, glucose and galactose, of which amount were 86.0, 4.0, 6.2 and 0.5％, respectively; while the dioxane-triethylamine-soluble fractions contained 81.3％ xylose, 6.8％ arabinose, 2.1％ glucose and 2.4％ galactose. The four alkalinesoluble fractions were composed of 82.0-90.2％ xylose, 4.7-7.5％ arabinose, 0.9-3.3％ glucose and 0.3-1.5％ galacose. Moreover, it was found that the hemicelluloses obtained by dioxane-triethylamine extraction had the relatively lower molecular weight of 17132 g/mol than the hemicellulosic preparations isolated by potassium hydroxide (35430-44712 g/mol). Furthermore, FT-IR,1H and 13C NMR analysis indicated that the alkali-soluble hemicelluloses had a structure composed of the (l-?4) -linked p-D-xylopyranosyl backbone with L-arabinofuranosyl group and 4-0-methyl-a-Dglucuronic acid attached to O-3 and O-2 of xylose in the backbone, respectively.

关键词： Dendrocalamus membranaceus Munro hemicelluloses isolation characteristics 13CNMR

作者: Xin W. Peng Jun L.Ren F.Peng Run C.Sun

作者单位: State Key Laboratory of Pulp and Paper Engineering,South China University of Technology, Guangzhou 5 Institute of Biomass Chemistry and Technology, Beijing Forestry University, Beijing 100083, China State Key Laboratory of Pulp and Paper Engineering,South China University of Technology, Guangzhou 5

会议类型: 国际会议

会议名称: 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)

会议地点: 天津

会议语种:英文

页码: 839-844

在线出版日期: 2011-06-08（万方平台首次上网日期，不代表论文的发表时间）