(哈尔滨商业大学 食品科学与工程省级重点实验室, 黑龙江 哈尔滨 150076)
(Provincial Key Laboratory for Food Science and Engineering, Harbin University of Commerce, Harbin 150076, China)
Using corn starch as raw material, the effect of debranching treatment on amylose leaching and formation of slowly digestible starch was studied below gelatinization temperature. Based on Guraya method, the SDS contents under various conditions were determined. A correlation between amylose leaching and SDS content was established. The granule morphology, crystallization properties, and thermal properties of starches were carried out through scanning electron microscope, X-ray diffraction, and differential scanning calorimetry. The results showed that amylose leaching was associated with SDS formation. The looseness of the starch surface was improved after debranching treatment below the gelatinization temperature while the crystal quality had greater influence on the formation of SDS compared with quantity. After debranching treatment onset temperature, peak temperature, and conclusion temperature of the corn starch increased, while gelatinization temperature range and enthalpy change decreased.