Physical modification of high amylose starch using electron beam irradiation and heat moisture treatment: The effect on multi-scale structure and in vitro digestibility

•Combined modifications target molecular structure and supramolecular arrangement.•EBI increased the branching degree of the starch at high irradiation dosage.•HMT increased the relative crystallinity and V-type fraction.•The combined modification results in more readily leached amylose during heating.•Depolymerization by EBI predominantly affects the changes in enzyme resistance.