Abstract
ABSTRACTThe increases in storage modulus (G′), retrogradation enthalpy change (ΔH) and ΔH‐related Avrami kinetic parameters of gelatinized rice starch dispersions at 25% (w/w) were investigated with respect to storage period, amylose content (AC), and molecular properties. Three high‐AC and five low‐AC rice cultivars were compared for understanding the multiple influences of AC and molecular properties involved. After refining the results of correlation analysis, the G′ of just‐cooled samples changed positively, mainly with AC and additionally with the average chain length of amylose (CLAM) and the weight ratio of extra‐long plus long chains to short chains of amylopectin (AP) (rAPchain). The developed ΔH on short‐term storage (10 days) elevated with increasing AC and CLAM and decreasing degree of polymerization of AP (DPAP), but after long‐term aging for one to three months with increasing rAPchain, especially for the low‐AC cultivars examined. Greater Avrami rate constants for retrogradation could be attributed to the combination of a lower DPAP and rAPchain or AP chain length and a greater CLAM. The polynomials using these critical factors to describe the retrogradation parameters were elucidated and could account for 85–99.6% of data deviations.
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