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FTIR characteristic spectrum bands of silkworm silk (cm−1)
| Structure | Amide I, cm−1 | Amide II, cm−1 | Amide III, cm−1 | Amide IV, cm−1 |
|---|---|---|---|---|
| β-Sheet | 1,625–1,640 | 1,515–1,525 | 1,265 | 700 |
| Random coil | 1,650–1,660 | 1,535–1,545 | 1,235 | 650 |
| α-Helix | 1,650 | 1,545 | 1,240 | 600 |
Abbreviation: FTIR, Fourier transform infrared spectroscopy.
