Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 144, Issue -, Pages 373-379Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2019.12.095
Keywords
Amylose; Molecular-order stability; Digestion rate
Funding
- National Key Research and Development Program of China [2018YFD0400802]
- National Natural Science Foundation of China [31701637]
- China Postdoctoral Science Foundation [2019T120708]
- China Association for Science and Technology [2018QNRC001]
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This work concerns the multi-scale structures and digestion behaviors of indica rice starches with apparent amylose contents (AACs) of ca. 14%-24%. A higher AAC not always allowed a lower digestion rate (k), different from previous findings that starches containing more amylose normally show slowed digestion. Here, the proportion of stable molecular orders (melting temperature above ca. 73 degrees C) and AAC synergistically governed starch digestion rate. With a similar AAC, a higher amount of stable orders (R-h/l, ratio of enthalpy of stable orders to that of the rest) led to a lower k. Also, with a similar R-h/l, a larger AAC caused a lower k. Consistently, JPZ starch had almost the highest AAC and R-h/l, showing the lowest k. Regarding this, amylose and stable orders played roles in increasing the bulk density of starch structure matrices, and eventually slow the diffusion, absorption and catalysis events of digestion enzymes within the matrices. (C) 2019 Elsevier B.V. All rights reserved.
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