Relations between molecular, crystalline, and lamellar structures of amylopectin
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Date
2012-12-01
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American Chemical Society
Abstract
Chain (branch) length distributions (CLD) from size-exclusion chromatography of a series of waxy starches were parametrized using both an empirical and a biosynthesis-based method and correlated with their crystalline amorphous lamellar properties obtained from X-ray scattering. Correlations were best seen with the biosynthesis-based parametrization. This showed for the first time that the following links between the CLD and lamellar parameters, the average interlamellar repeat distance and the distribution of these distances, were decreased by an increase in the proportion of very short branches and were increased by an increase in the proportion of intermediate and longer chains; further, the shoulder and linear sections of the CLD were found to affect the lamellar repeat distance and distribution. These effects are rationalized in terms of branch-length effects on the production of crystallites and :he presence of portions of longer branches in the amorphous regions. © 2012 The American Physical Society
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Keywords
Anions, Chromatography, Small angle scattering, Starch, Wheat, Biosynthesis
Citation
Witt, T., Doutch, J., Gilbert, E. P., & Gilbert, R. G. Relations between molecular, crystalline, and lamellar structures of amylopectin. Biomacromolecules, 13(12), 4273-4282. doi:10.1021/bm301586x