Effects of dual modification on physicochemical and digestibility properties of rice starch
Xiwu Jia1, Xiaohua Luo2, Zhili Ji1
1Department of Food Science and Engineering, Wuhan Polytechnic University, Wuhan 430023, China; Key Laboratory for Deep Processing of Major Grain and Oil, Ministry of Education, Wuhan Polytechnic University, Wuhan 430023, China.
Abstract:
The physicochemical properties of rice starch were regulated using a modification method that combined ultrasound with hydrothermal treatments. Compared with native starch, hydrothermal-treated starch exhibited significantly altered the structure and physicochemical characteristics at differential scanning calorimetry characteristic temperatures. The modified starch exhibited increased gelatinization temperature, particle size, and resistant starch content but decreased enthalpy, retrogradation value, short-range order, and relative crystallinity, showing a temperature-dependent downward trend. Compared with hydrothermal treatment alone, ultrasound-assisted hydrothermal treatment further increased the gelatinization temperature while reducing enthalpy, and retrogradation value. The starch sample subjected to ultrasound-temperature-controlled (TC) hydrothermal treatment exhibited the lowest structural ordering, with a minimum retrogradation and breakdown value of 267.00 cp and 121.50 cp, respectively, and the highest slowly digestible starch content reaching 42.26%. Within the starch gel system, compared to other temperature treatments, the ultrasound-TC hydrothermal treatment demonstrated superior shear resistance and viscoelastic properties.
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