Digestive and Physicochemical Properties of Small Granular Starch from Euryale ferox Seeds Growing in Yugan of China

Abstract

In this study, the morphological, physicochemical and digestibility properties of Yugan Euryale ferox seeds starch (Y-EFS) were comprehensively analyzed. The results showed that Y-EFS contained 45.85% amylose. These starch granules of Y-EFS appeared as irregular polyhedron shape with smooth surface and relatively uniform size around 2.29 μm. The determined average molecular weight of Y-EFS were 1.85 × 10 5 and 3.00 × 10 3 Da, respectively. X-ray diffraction verified that Y-EFS was a typical A-type starch with 38.84% relative crystallinity, which demonstrated that Y-EFS had a relatively high crystallinity and larger crystallization area. Differential scanning calorimeter analysis showed that Y-EFS had relatively high gelatinization enthalpy (ΔH = 1576.0 J/g) and temperature (To = 84.69 °C, Tp = 110.30 °C and Tc = 118.10 °C). The results of rapid viscometer analyzer demonstrated that pasting temperature of Y-EFS was 82.27 °C, and high setback value indicated that Y-EFS was possibly easy to retrograde. Y-EFS gel displayed small adhesiveness and high hardness. In vitro digestion study showed that Y-EFS was indigestible because of its 37.54% slowly digestible starch and 36.46% resistant starch content. Our results suggest that Y-EFS has great application prospect in hypoglycemic functional foods.

Extraction, identification, and starch‐digestion inhibition of phenolics from Euryale ferox seed coat

“…The sieved slurry was used to separate and purify EFS according to our previous reported experimental method. 19…”

“…The slurry was sieved through a 60‐mesh sieve to remove the EFCs, which were further dried at 40 °C for the extraction of phenolics. The sieved slurry was used to separate and purify EFS according to our previous reported experimental method 19 …”

Euryale ferox , a prominent superfood: Nutritional, pharmaceutical, and its economical importance

“…The A‐type starch proving that E. ferox seed had a significantly high crystallinity and bigger crystallization area. E. ferox seeds also had a relatively high temperature and gelatinization enthalpy (Zhang et al, 2022). The crude polysaccharides were extracted from E. ferox by different methods.…”

Esterified unpopped foxnut (Euryale ferox) starch: molecular and rheological characterization

“…10 High percentages of butylated hydroxytoluene, linoleic acid, and tocopherols are found in the essential oil of fox nut and they exhibit a significant amount of scavenging activity. 11 So far, fox nut starch has been studied for its physicochemical properties, 12 as a slowly digestible starch for its processing and digestive properties, 13 as a resistant starch, 14 and as an octenyl succinic anhydride (OSA)-modified starch for stabilizing Pickering emulsions. 15 However, as far as the authors are aware, no work has been reported in the literature on the acetylation of unpopped fox nut starch to the degree of acetylation authorized by FDA for food applications.…”

“…So far, fox nut starch has been studied for its physicochemical properties, 12 as a slowly digestible starch for its processing and digestive properties, 13 as a resistant starch, 14 and as an octenyl succinic anhydride (OSA)‐modified starch for stabilizing Pickering emulsions 15…”