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Table 4 Infrared band assignment of silk sericin and SS-capped AgNPs

From: Green synthesis of silk sericin-capped silver nanoparticles and their potent anti-bacterial activity

IR band (cm−1) Band assignment
1,700 to 1,600 Amide I (C = O stretching vibration)
1,560 to 1,500 Amide II (N-H bending and C-N stretching vibration)
1,300 to 1,200 Amide III (C-N-H in-plane bending and C-N stretching vibration)
1,451, 1,404, 1,353 Free carboxylate groups (COO stretching vibration)
830 Amine salt