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Waigh, Thomas A. ; Donald, Athene M. ; Heidelbach, Florian ; Riekel, Christian ; Gidley, Michael J.:
Analysis of the native structure of starch granules with small angle x-ray microfocus scattering.
In: Biopolymers.
Bd. 49
(1999)
Heft 1
.
- S. 91-105.
ISSN 1097-0282
DOI: https://doi.org/10.1002/(SICI)1097-0282(199901)49:1<91::AID-BIP9>3.0.CO;2-9
Abstract
Small angle x-ray microfocus scattering patterns were obtained from 4 ?m regions of hydrated potato starch granules. The 9 nm lamellar reflection was found to be modulated along two flat streaked layer lines symmetrically related, and arranged in a weak four point pattern. This provides evidence for two populations of tilted lamellae in the granule present in equal quantities, but opposite angles of tilt. The paucity of reflections in the scattering patterns implies the existence of correlated disorder between the lamellae, and is a product of either their liquid crystallinity or a well-developed defect structure between the constituent amylopectin helices. The angular position of the four point modulation (17.25°) on the scattering patterns is compared with the values predicted from a superhelical lamellar model containing cumulative disorder along its axis, and good agreement is found with the data. The physical basis for the occurrence of these helical lamellae is examined on the basis of the model of amylopectin as a chiral side chain liquid- crystalline polymer (T. A. Waigh et al., Macromolecules, 1997, Vol. 30, pp. 3813-3820; Faraday Discussions, 1996, Vol. 103, pp. 325-337).
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Keywords: | starch granule; small angle x-ray microfocus scattering; correlated disorder; amylopectin; side chain liquid crystal polymer |
| Institutionen der Universität: | Forschungseinrichtungen > Forschungszentren > Bayerisches Forschungsinstitut für Experimentelle Geochemie und Geophysik - BGI Forschungseinrichtungen Forschungseinrichtungen > Forschungszentren |
| Titel an der UBT entstanden: | Nein |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften, Geologie |
| Eingestellt am: | 04 Nov 2020 08:52 |
| Letzte Änderung: | 04 Nov 2020 08:52 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/58895 |