Journal
CARBOHYDRATE POLYMERS
Volume 75, Issue 4, Pages 705-711Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2008.09.017
Keywords
Wheat starch; Triticum aestivum; Amylose; Amylopectin; Small-angle X-ray scattering; Granule structure; X-ray diffraction; Differential scanning calorimetry
Categories
Funding
- Value Added Wheat CRC Ltd
- NANO Major National Research Facility at the Electron Microscope Unit
- The University of Sydney
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Small-angle X-ray scattering (SAXS) together with several complementary techniques. such as differential scanning calorimetry and X-ray diffraction, have been employed to investigate the structural features that give diverse functional properties to wheat starches (Triticum aestivum L.) within a narrow range of enriched amylose content (36-43%). For these starches, which come from a heterogeneous genetic background. SAXS analysis of duplicate samples enabled structural information to be obtained about their lamellar architecture where differences in lamellar spacing among samples were only several tenths of nanometer. The SAXS analysis of these wheat starches with increased amylose content has shown that amylose accumulates in both crystalline and amorphous parts of the lamella. Using waxy starch as a distinctive comparison with the other samples confirmed a general trend of increasing amylose content being linked with the accumulation of defects within crystalline lamellae. We conclude that amylose content directly influences the architecture of semi-crystalline lamellae, whereas thermodynamic and functional properties are brought about by the interplay of amylose content and amylopectin architecture. (C) 2008 Elsevier Ltd. All rights reserved.
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