SPRUCE GLUCOMANNAN;PREPARATION, PURIFICATION, CHARACTERIZATION AND DERIVATIZATION
(Galacto)glucomannans are the major hemicelluloses present in softwood species which are important raw materials for Swedish forest industry. In order to utilize spruce wood more comprehensively than by e.g. kraft pulping under a biorefinery concept, it is important to exploit the hemicelluloses as valuable products. In this study, therefore, one waterinsoluble glucomannan (GM), composed mainly of glucose and mannose, has been prepared from spruce wood holocellulose in a yield of 6.7％ by NaOH/H3BO4 extraction and Fehling reagent precipitation. It was further purified and characterized by IC, SEC, 1H- and 13C-NMR and FTIR spectroscopy in terms of carbohydrate composition, molecular size distribution, chemical structure and purity. It has been concluded that the purified GM is composed of galactose, glucose and mannose in a ratio of approximately <0.1:1:3.5. It is large in molecular size (Mp ~27kDa), almost free from other polysaccharides such as xylan (0.61％) and free from metal ions (<0.2 ％ ash content). After acetylation, yellowish transparent brittle films were obtained when casted from chloroform solutions of the acetylated GM. Therefore, potential applications of this GM of high values include applications as packaging materials and coatings.
film casting FTIR (galacto)glucomannan holocellulose NMR spruce
Yujia Zhang Jiebing Li Mikael E. Lindstr(o)m Agnes Stepan Paul Gatenholm
Department of Fibre and Polymer Technology, Royal Institute of Technology, KTH, SE-100 44, Stockholm Department of Fibre and Polymer Technology, Royal Institute of Technology, KTH, SE-100 44, Stockholm Department of Chemical and Biological Engineering, Biopolymer Technology, Chalmers University of Tec
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
478-483
2011-06-08（万方平台首次上网日期，不代表论文的发表时间）