What You Need to Know
The repeated shear forces break down starch granules, exposing amylose and amylopectin chains to water. This mechanical disruption lowers the crystallinity of amylopectin, raising the gelatinization temperature by about 5 °C and reducing the effective viscosity of amylose, which together create the characteristic chewiness of East Asian rice cakes.
The Science
Primary Reaction
Mechanical disruption of starch granules leading to gelatinization upon heating