A Combined Ultrasound–Microwave Assisted Alcoholic–Alkaline Method for Preparation of Granulated Cold-Water-Soluble Starch

Abstract

In order to further improve the solubility of granulated cold-water-soluble starch (GCWSS), this study develops a new, combined ultrasound–microwave assisted method based on the traditional alcoholic–alkaline method. Following a single-factor experiment, an orthogonal experiment is conducted to determine optimized parameters and proportions. Three typical samples with relatively low, medium, and high solubility, respectively, are selected for characterization, including with scanning electron microscopy (SEM), polarization characteristics, Brabender viscosity, Fourier transform infrared spectroscopy (FTIR), and differential scanning calorimetry (DSC). The results show that the combined ultrasound–microwave treatment significantly improves the solubility of modified starch, achieving a highest sample solubility of 92.45%.