“…The spectra of starch‐ g ‐polyacrylamide (PAM) after water extraction shows all the absorption peaks of the native starch. Additionally, the peaks detected at 3425, 1658 and 1600 cm −1 indicate NH stretching, CO stretching and NH bending of the amide bands, respectively, which are characteristics of the CONH 2 group contained in acrylamide 6, 10, 15–17. Furthermore, the peak at 1409 cm −1 indicates CN stretching and that at 765–710 cm −1 indicates a weak band of NH out‐of‐plane bending 6, 10, 16, 17, which are the typical absorption bands of the amide.…”