The ball milling treatment was carried out with a QM-3SP4 ball mill (Nanjing University Instrument Plant, Jiangsu, China). Waxy maize starch (10 g, dry basis) was placed in a 50-mL mill pot, and 30 mL anhydrous ethanol was added to disperse the starch. The operation was performed at a rolling speed of 300 rpm for 15, 30, 45, 60, 75, and 90 …