Abstract
A polymer — analogous to starch — was previously prepared by biotransformation from sucrose and the enzyme amylosucrase. The reaction yields a crystalline precipitate of a molecule of degree of polymerisation 60–100 glucose units and fructose monomer. The molecular characterisation of the polymer by 13C-NMR revealed a 1,4-coupling of the anhydroglucose units via the alpha glycosidic bond in a strictly linear manner. The new polymer is soluble in ln KOH and DMSO at 20°C. The crystalline precipitate, as synthesised, shows in X-ray wide angle powder diffraction the B-structure of native potato starch. Upon heating in the presence of 18% by weight of water the crystallites transform to the A-structure of native wheat starch. The phase diagram of the new polymer, starch and the solvent/non-solvent shows — above a critical concentration — the formation of a gel phase that comprises an elastically active network. In this network the cross-links are the crystallites of the two polymers with an entirely new structure and the tie molecules are the long branches of the amylopectine. Such gels can be made by an extrusion • process and shaped into oriented, elastic fibers and films.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Similar content being viewed by others
References
Kossmann, J., Büttcher, V., Welsh, T. Patent: Dna Sequences Coding For Enzymes Capable Of Facilitating The Synthesis Of Linear ‘Alpha’-1,4 Glucans In Plants, Fungi And Microorganisms, WO-A-95/31 553
Harada, T., Misaki, A., Akai, H., Yokobayashi, K. and Sugimoto, K., 1972, Characterisation of Pseudomonas isoamylase by its actions on amylopectin and glycogen: Comparison with Aerobacter pullulanase, Biochim. Biophys. Acta, 268: 497.
Hijka, H., Joshida, M. Patent: Process For The Production Of Amylose Films, US-A-3734760
Gallert, K-CH., Bengs, H. and Simandi, C. Patent: Polyglucan And Polyglucan Derivatives Which Can Be Obtained From Amylosucrase By Biocatalytic Production In The Presence Of Biogenic Substances, WO-A-00/22155.
Willenbücher, R. W., Tomka, I., and Müller, R., 1992, Thermally Induced StructuralTransitions in the Starch-Water System. In Prog. Plant. Polym. Carbohydr. Res. (II part: Proc. Int. Symo. Plant. Polym. Carbohydr.) 7th volume, Behr’s Verlag, Hamburg, Germany, pp. 219–225.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2001 Springer Science+Business Media New York
About this chapter
Cite this chapter
Tomka, I., Müller, R., Hausmanns, S., Mertins, P. (2001). The New Starch. In: Chiellini, E., Gil, H., Braunegg, G., Buchert, J., Gatenholm, P., van der Zee, M. (eds) Biorelated Polymers. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-3374-7_2
Download citation
DOI: https://doi.org/10.1007/978-1-4757-3374-7_2
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4419-3369-0
Online ISBN: 978-1-4757-3374-7
eBook Packages: Springer Book Archive