| Wave length Description | Chitosan Wavelength (cm−1) | Areca Fiber Wavelength (cm−1) | Banana Fiber Wavelength (cm−1) |
| N−H bending | 1553, 1660 | 1508, 1648 | 1637 |
| O−H stretching | 3350 | 3322 | 3300 |
| −CH2 and −CH3 Stretching | 2930 | 2923 | 2930 |
| C−H bending of CH2 group | 1376 | 1245 | 1317 |
| C−C−O stretching | 1130 | - | 1154 |
| C6−O stretching | 1080 | 1040 | 1027 |
| −C−O stretching | 1430 | - | 1430 |
| C=O stretching | - | - | 1740, 1637 |