Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 120, Issue -, Pages 2017-2025Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijbiomac.2018.09.204
Keywords
Chain-length distribution; Molecular size; Amylopectin; Amylose; Rice starch
Funding
- National Key R&D Program of China [2018YFD0400600]
- Beijing Excellent Talents Funding for Youth Scientist Innovation Team [2016000026833TD01]
- High-level Teachers in Beijing Municipal Universities [IDHT20180506]
- Construction of Scientific Research Base and Innovation Platform [19008001226]
- Foundation for Young Scientist of Beijing Technology and Business University [PXM2018_014213_000033]
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Starch molecular structure, in terms of chain-length distribution (CLD) and molecular size, are important structural features regarding to (starch) structure-property relations for starch-based foods. In this study, amylopectin CLDs from fluorophore-assisted carbohydrate electrophoresis (FACE) are parameterized by a biosynthesis based model, amylose CLDs and molecular sizes of amylose and amylopectin are measured by size-exclusion chromatography (SEC), and statistically meaningful relationships are established between starch CLDs, starch molecular size, and amylose content using rice starches with a wide range of amylose content. This shows that amylopectin molecular size is increased by increasing the proportion of short amylopectin chains with degree of polymerization (DP) 6-32 and decreasing the percentage of long amylopectin chains with DP 63-100. On the other hand, molecular sizes of both branched amylopectin and amylose molecules are negatively correlated with amylose content, suggesting that high-amylose rice tends to have smaller amylopectin and amylose molecular sizes. These relations are rationalized in terms of chain-length effects on the production of branched amylopectin and amylose molecules between different rice cultivars, which could provide new insights regarding to starch structure-property relations. (C) 2018 Elsevier B.V. All rights reserved.
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