Spruce glucomannan; preparation, purification, characterization and derivatization
2011 (English)In: Int. Symp. Wood, Fiber Pulping Chem. - Proc., ISWFPC, 2011, 478-483 p.Conference paper (Refereed)
(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 water-insoluble glucomannan (GM), composed mainly of glucose and mannose, has been prepared from spruce wood holocellulose in a yield of 6.7% by NaOH/H 3BO 4 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.
Place, publisher, year, edition, pages
2011. 478-483 p.
, 16th International Symposium on Wood, Fiber and Pulping Chemistry - Proceedings, ISWFPC, 1
(galacto)glucomannan, Film casting, FTIR, Holocellulose, NMR, Spruce, Glucomannan, Acetylation, Carbohydrates, Cellulose, Characterization, Fourier transform infrared spectroscopy, Glucose, Kraft process, Metal ions, Nuclear magnetic resonance, Packaging materials, Purification, Wood, Film preparation, Film, Picea
Paper, Pulp and Fiber Technology
IdentifiersURN: urn:nbn:se:kth:diva-150222ScopusID: 2-s2.0-84862948420OAI: oai:DiVA.org:kth-150222DiVA: diva2:742359
16th International Symposium on Wood, Fiber and Pulping Chemistry, ISWFPC, 8 June 2011 through 10 June 2011, Tianjin, China
QC 201409012014-09-012014-09-012014-09-01Bibliographically approved