Abstract:The moisture content of porous starch was controlled at 10%, 15%, and 20%, and heat-moisture treatment was performed at 115 ℃ for 1 h to study the effect of heat-moisture treatment on the structure and properties of porous starch. The results indicated that heat-moisture treatment partially destroyed the porous structure of porous starch and reduced its absorptive capacity. The crystal structure of porous starch exhibited no obvious change; however, the degree of crystallinity decreased. Additionally, following heat-moisture treatment, the solubility, swelling capacity, and light transmittance of the porous starch decreased, but the freeze-thaw stability increased and presented a corresponding trend with increases in water content. Heat-moisture treatment increased the pasting temperature, retrogradation, and hot-paste stability of porous-starch paste, whereas decrease the peak viscosity. After heat-moisture treatment, the content of resistant starch in porous starch was altered. When the moisture content was 15%, the content of resistant starch in the resultant porous starch was relatively high (27.67%). Heat-moisture treatment exhibited clear effects on the relevant properties of porous starch, with the changes depending on moisture content during treatment.
