Highlights
► High-amylose rice TRS starch was more resistant to AAG hydrolysis than TQ starch. ► Crystalline structure was hydrolysed faster than the amorphous structure. ► The AAG hydrolysis pattern of TRS starch was different from that of TQ starch. ► A-type polymorph of TRS C-type starch was hydrolysed faster than B-type polymorph. ► The external region with B-type crystal increased resistance of TRS starch to AAG.