Table 1 Infrared band assignment of silk sericin (SS), AgNO₃, and SS-Ag nanoparticles

1700–1600

Amide I (C=O stretching vibration)

1560–1500

Amide II (N–H bending and C–N stretching vibration)

1300–1200

Amide III (C–N–H in plane bending and C–N stretching vibration)

1107,1148, 1360,1462

Free carboxylate groups (COO– stretching vibration)

3365, 3370, 3380, 3385

Amine N–H stretching vibration

830

Amine salt