Isolation, Characterisation and Material Properties of 4-O-Methylglucuronoxylan from Aspen
Hemicelluloses are among the most abundant biopolymers although they are not yet being used as materials. This study focused on isolating polymeric 4-O-methylglucuronoxylan, which is the most abundant heteropolysaccharide (hemicellulose) in aspen wood (Populus tremula). The wood chips were extracted sequentially with different liquids. The isolated xylan was analysed for carbohydratate composition, molecular weight and crystallinity. The alkali extraction procedure used is selective and yields a high xylose containing polymeric xylan from aspen wood. The xylan showed fair film forming properties, which were enhanced when the xylan was carboxymethylated in homogenous alkali solution. The carboxymethylated xylan was water soluble and formed excellent films which were partially crystalline.
KeywordsHigh Performance Liquid Chromatography Steam Explosion Carbohydrate Composition Wood Chemistry Aspen Wood
Unable to display preview. Download preview PDF.
- 1.Hon, D.N.-S., 1996, Chemical Modification of Lignocellulosic Materials, Chap 1, Marcel Dekker Inc., New York, pp 2–3Google Scholar
- 2.Kleppe, P.J., 1970, Kraft pulping, Tappi, 53: 35–47Google Scholar
- 3.Roberts, J.C., and El-Karim, S.A., 1983, The behavior of surface adsorbed xylans during the beating of a bleached kraft pine pulp, Cellulose Chemistry and Technology, 17: 379–386Google Scholar
- 9.Dahlman, O., Jacobs, A., Liljenberg, A. and Ismail Olsson, A., 2000, Analysis of carbohydrates in wood and pulps employing enzymatic hydrolysis and subsequent capillary zone electrophoresis, J. Chromatogr. A 891: 157–174Google Scholar
- 10.Berggren, R., Berthold, F., Sjöholm, E. and Lindström, M., 2000, Degradation patterns and strength development of fibres subjected to ozone degradation or acid hydrolysis, 6th European Workshop on Lignocellulosics and Pulp, Bordeaux, pp. 205–208.Google Scholar
- 12.Sjöström, E., 1981, Wood Chemistry, Fundamentals and Applications, San Diego, CA, Academic PressGoogle Scholar
- 14.Shimizu, K., Sudo, K., Ono, H., and Fujii, T., (1989), Wood Processing and Utilization, (J. F. Kennedy, G.O. Phillips, P. A. Williams, eds.) Ellis Horwood, Chicester, pp 407–412Google Scholar
- 15.Teleman, A., Harjunpää, V., Tenkanen, M., Buchert, J., Hausalo, T., Drakenberg, T. and Vuorinen, T., 1995, Characterisation of 4-deoxy-b-L-threo-hex-4-enopyranosyluronoc acid attached to xylan in pine kraft pulp and pulping liquor by 1H and 13C NMR spectroscopy, Carbohydrate Research 272: 55–71.CrossRefGoogle Scholar
- 17.O’Dwyer, M.H. (1926) LXXXVI. The hemicelluloses. Part IV. Biochem.J. Google Scholar
- 18.Glasser, W.G., Jain, R.K. and Sjöstedt, M.A., (1995) Thermoplastic pentosan-rich polysaccharides from biomass, US patent #5,430,142Google Scholar