Table 3. Assignment of FT-IR Bands of HA.
wavenumber (cm–1) | functional groups | |
---|---|---|
3690 |
|
|
3390 | phenolic −OH hydroxyl groups | |
2925 | aliphatic C–H bands | |
1575 | antisymmetric νCOO– of carboxyl salt | |
1380 | symmetric νCOO– of carboxyl salt | |
1100 | νCO (phenolic), νOH (aliphatic) | |
1040 | νC–N | |
1005 | νCO | |
910 | out-of-phase δCH (aromatic) |