The effect of twin-screw extrusion strengthened enzymatic synthesis of corn starch ferulate on corn starch multiscale structure and physicochemical properties.

This study investigated the effect of twin-screw extrusion strengthened enzymatic synthesis of corn starch ferulate on corn starch multiscale structure and physicochemical properties. Different techniques (FT-IR, XRD, Raman spectroscopy, 1H NMR, SEM, AFM, and CLSM) were used to explore the effect of twin-screw extrusion strengthened enzymatic synthesis of starch ferulate on corn starch (CS) structure. It shows that CS and ferulic acid underwent covalent interaction under the catalysis of lipase to synthesize corn starch ferulate (CS/FE), which increased the short-range order degree, helical arrangement degree, and psize of CS. Besides, new characteristic peaks of CS/FE emerged at wavenumbers 706 cm-1 and 672 cm-1, and new signal peaks appeared at the δ = 0.8 ppm shift, which confirmed the successful synthesis of starch ferulate. In addition, the CS/FE synthesized by this method has enhanced thermal stability, elasticity, and resistant starch content. This work provides a theoretical reference for developing functional starch foods.