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Updated: Feb 3, 2026

Analysis and Specification of Starch Granule Size Distributions
Published on: March 4, 2021
In vitro hydrolysis and estimated glycemic index of jackfruit seed starch prepared by improved extrusion cooking
Yutong Zhang1, Yanjun Zhang2, Bo Li3
1College of Food Science, Heilongjiang Bayi Agricultural University, Daqing 163319, Heilongjiang, China; Spice and Beverage Research Institute, Chinese Academy of Tropical Agricultural Sciences, Wanning 571533, Hainan, China.
Abstract:
The effect of improved extrusion cooking technology (IECT) on jackfruit seed starch (JFSS) digestion properties was investigated by the in vitro starch hydrolysis, hydrolysis index (HI) and glycaemic index (GI). The IECT markedly increased the content of rapidly digestible starch (RDS), slowly digestible starch (SDS), equilibrium concentration (C∞), HI, GI, and the rate of starch digestion but decreased in resistant starch (RS). Increasing the temperature and screw speed resulted in significant increases in SDS, C∞, HI, GI, and decreases in RDS, RS content. The scanning electron microscope demonstrated the digestion result that the JFSS changed from more compact structure to more loose polyhedral and from fewer pits to number of hollows. However, the opposite results were observed for increasing moisture content. All these results suggested that the in vitro digestibility of the high amylose and small granules JFSS can be efficiently enhanced by the improved extrusion cooking treatment.
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