Table 1.
FT-IR analysis of SA, chitosan, and collagen
| Material | Wave number (cm-1) | Peak assignment |
|---|---|---|
| SA | 3,300 to 2,500 | Overlapping stretching vibration of C-H and O-H groups (νC-H-νOH) |
| 1,693 | -C=O group (νC=O) | |
| 1,413 | C-O-H in-plane bending ( δC-O-H) | |
| 1,297 | C–O stretching vibration (νC-O) | |
| 920 | Out-of-plane bending of the bonded O-H (δO-H) | |
| Chitosan | 3,200 | -NH2 stretching vibration (νNH) |
| 2,832, 2,765, 2,720 | Symmetric or asymmetric -CH2 stretching vibration attributed to the pyranose ring (νC-H) | |
| 1,633 | -C=O in acetamide group (amide I band) | |
| 1,592 | -NH2 bending vibration in amino group (δNH) | |
| 1,420, 1,320 | Vibrations of OH, CH in the ring | |
| 1257 | C-O group | |
| 1157 | -C-O-C in the glycosidic linkage | |
| 1,076, 1,029 | C-O stretching in acetamide (νC-O) | |
| 899 | Corresponds to the saccharide structure | |
| Collagen | 3,326 | -NH2 stretching vibration (νNH) |
| 3,081 | Fermi resonance overtone of 1,553 band | |
| 2,958 | C-H stretching (νC-H) | |
| 1,658 | Amide I band (νC=O) | |
| 1,553 | Amide II band (δNH) | |
| 1,400 | Amide III band (νC-N) | |
| 1,239 | C-N stretching of amine (νC-N) | |
| 655 | Out-of-plane N-H wagging of amide and amine (δNH) |
ν, stretching; δ, bending.