Berlin 2005 – wissenschaftliches Programm
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AKB: Biologische Physik
AKB 100: Poster Session I
AKB 100.56: Poster
Samstag, 5. März 2005, 16:45–18:45, Poster TU D
Structural studies and hydration kinetics of starch granules by synchrotron radiation microdiffraction — •Henrik Lemke1,2, Jean-Luc Putaux3, Manfred Burghammer2, Martin Müller1, and Christian Riekel2 — 1Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel — 2European Synchrotron Radiation Facility, Grenoble, Frankreich — 3CERMAV-CNRS, Grenoble, France
The structure and hydration kinetics of single starch granules from several biological sources were investigated by scanning X-ray microdiffraction. Combined small- and wide-angle scattering experiments at the 1 micron level allowed examining the variation of the amylopectin microstructure and the lamellar superstructure at multiple length scales in fully hydrated granules of 10-50 microns diameter. Differences in variation of azimuthal width of the equatorial 100-reflection and the meridional 9-nm peak agree to the model of a radial organization of amylopectin fibrils. Starch particles from different genetic origins appear to differ in small-angle scattering due to variations in lamellar ordering. A fast hydration kinetics of dried starch granules with about 7 sec half-time could be observed by synchronizing a drop-on-demand system with the data collection system. The timescale of hydration at the unit cell level and of the hydration-induced lamellar superstructure formation seem to be comparable.