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Structure and physicochemical properties of low digestible Euryale ferox Salisb seeds starch.

BACKGROUND
Euryale ferox Salisb is widely grown in China and Southeast Asia as a grain crop and medicinal plant. The composition, morphology, structure, physicochemical properties, thermal properties and in vitro digestibility of North Euryale ferox seeds starch(NEFS), Hybrid Euryale ferox seeds starch(HEFS) and South Euryale ferox seeds starch(SEFS) were studied.


RESULT
Among them, amylose content of NEFS(23.03%) was the highest. Starch granules of each variety were smooth, sharp, small and an average diameter of 2 μm. All three varieties are A-type crystals with crystallinity ranged from 26.42% to 28.17%, meanwhile the degree of double helix and short-range order of them ranged from 1.9006 to 2.5324 and 1.4294 to 1.6006, respectively. A higher proportion of C1 region in NEFS(17.74%) and HEFS(17.66%) were found. NEFS included the highest To(71.43°C), Tp(76.60°C), Tc(82.77°C), ΔH(12.64 J/g) and peak viscosity(1514 mPa·s). All three varieties maintained a low level of in vitro digestibility, with the highest RS content (29.57%), the lowest RDS content (27.07%) and the slowest hydrolysis kinetic constant(0.0303) in NEFS.


CONCLUSION
The results revealed that low digestibility of NEFS was attributed to compact granules, high crystallinity, high degree of order and strong thermal stability. These digestive, physicochemical and thermodynamic properties provided more information for the future application of Euryale ferox seeds starch in the field of food. This article is protected by copyright. All rights reserved.