Relations between molecular, crystalline, and lamellar structures of amylopectin

Witt, Torsten, Doutch, James, Gilbert, Elliot P. and Gilbert, Robert G. (2012) Relations between molecular, crystalline, and lamellar structures of amylopectin. Biomacromolecules, 13 12: 4273-4282. doi:10.1021/bm301586x

Author Witt, Torsten
Doutch, James
Gilbert, Elliot P.
Gilbert, Robert G.
Title Relations between molecular, crystalline, and lamellar structures of amylopectin
Journal name Biomacromolecules   Check publisher's open access policy
ISSN 1525-7797
Publication date 2012-12-01
Year available 2012
Sub-type Article (original research)
DOI 10.1021/bm301586x
Open Access Status Not yet assessed
Volume 13
Issue 12
Start page 4273
End page 4282
Total pages 10
Place of publication Washington, DC United States
Publisher American Chemical Society
Language eng
Subject 1502 Bioengineering
2502 Biomaterials
2507 Polymers and Plastics
2505 Materials Chemistry
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 the presence of portions of longer branches in the amorphous regions
Keyword Anion exchange chromatography
Small angle neutron scattering
Starch granules
Chain length
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

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