Effect of Different Hydrothermal Treatments on Pasting, Textural, and Rheological Properties of Single and Dual Modified Corypha Umbraculifera L. Starch

Starch isolated from Corypha umbraculifera L. (talipot palm), a non-conventional source of starch, is modified by heat-moisture treatment (HMT), annealing (ANN), autoclaving (AUT), and HMT followed by AUT (HMT-AUT), and ANN followed by AUT (ANN-AUT). The effect of single and dual treatments on physicochemical, structural, and functional properties of starch is studied. All treated samples showed an A-type crystalline pattern, however, the relative crystallinity increased by treatments from 16.35 +/- 0.42% to 26.76 +/- 0.64%, and the highest relative crystallinity is observed for ANN starch. The swelling power and solubility significantly changed (p <= 0.05) after modifications (S1). A higher pasting temperature and final viscosity are noticed in ANN-AUT and AUT, respectively. However, all the treatments markedly decreased the breakdown viscosity. A higher gel hardness value of 112.58 +/- 1.2 N is observed in the HMT-AUT starch sample.

Automated summary

The starch isolated from talipot palm was modified by various treatments, leading to increased crystallinity, significant changes in swelling power and solubility, and variations in pasting temperature, viscosity, and gel hardness.