Molecular organization in starches: a carbon 13 CP/MAS NMR study

Gidley, Michael J. and Bociek, Stephen M. (1985) Molecular organization in starches: a carbon 13 CP/MAS NMR study. Journal of The American Chemical Society, 107 24: 7040-7044. doi:10.1021/ja00310a047


Author Gidley, Michael J.
Bociek, Stephen M.
Title Molecular organization in starches: a carbon 13 CP/MAS NMR study
Formatted title
Molecular organization in starches: a carbon 13 CP/MAS NMR study
Journal name Journal of The American Chemical Society   Check publisher's open access policy
ISSN 0002-7863
1520-5126
Publication date 1985
Sub-type Article (original research)
DOI 10.1021/ja00310a047
Volume 107
Issue 24
Start page 7040
End page 7044
Total pages 5
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Formatted abstract
Cross polarization/magic angle spinning (CP/MAS) 13C NMR spectra have been obtained for starches from various botanical origins and analyzed by comparison with model materials. All features of starch 13C CP/MAS spectra are accounted for by a combination of amorphous (single chain) and ordered (double helix) components. The proportion of each of these structural types present in native starches can be estimated from 13C CP/MAS spectra. This provides the first approach to the quantitative analysis of starch molecular structures; the values obtained can be compared with estimates of longer range ordering from X-ray powder diffraction. C-1 and C-4 carbons (i.e., those sites involved in glycosidic linkage) show large chemical shift displacements between amorphous and crystalline materials indicating substantial conformational differences. Chemical shift displacements between the two common crystalline types (A and B) of starches are much smaller but model crystalline materials show polymorphic variations in C-1 multiplicity which can be ascribed to known differences in the symmetry of double helix packing. The chemical shift ranges observed for spectral features of amorphous materials suggest that part of the amorphous component of starches has a well-defined conformation.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Centre for Nutrition and Food Sciences Publications
 
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Created: Wed, 16 Mar 2011, 20:32:50 EST