Starch retrogradation involves both short- and long-range intermolecular interactions, while their relations with starch chain-length distribution (CLD) and digestibility are less clear. To address this, 9 types of starches with distinct CLDs were analyzed for intermolecular interactions and digestibility over 7 days of retrogradation. Wheat starch exhibited a higher ratio of long-range intermolecular interactions, while pea, mung bean, potato, sweet potato, lentil, and corn starch formed more short-range intermolecular interactions. All retrograded starches displayed B + V crystallinity with characteristic peaks at 17°, 20°, and 22°. The pores of some starch hydrogels shrank after retrogradation. Most importantly, positive correlations were for the first time observed between amylose chains of 100 < DP ≤ 5000 and intermolecular interactions. Whereas a higher level of the intermolecular interactions was negatively correlated with enzymatic binding rate constants (the rate-limiting step of digestion) and maximum digested percentages. In conclusion, these results suggest that starches with more amylose chains with 100 < DP ≤ 5000 are preferable in terms of promoting a slow starch digestibility.
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| http://dx.doi.org/10.1016/j.ijbiomac.2025.141728 | DOI Listing |
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