| Accounted Band for the Absorption | Wavenumbers (Cm−1) | |
| Ayous Sawdust | CNC | |
| O–H Stretching Intramolecular Hydrogen Bond | 3600 - 3200 | 3600 - 3200 |
| C–H stretching | 2891 | / |
| C=O Stretching of the Carbonyl and Acetyl Groups | 1733 | / |
| O–H Bending of Water | 1642 | 1648 |
| C=C Stretching Vibration Aromatic of Lignin | 1508 | / |
| –C–O–C stretching | 1456 | 1453 |
| C–H Asymmetric Deformation | 1421 | 1416 |
| C–H Bending | 1373 | / |
| –C–O–C Aryl-Alkyl Ether | 1226 | / |
| C–O–C Glycoside Ether Band of Hemicellulose | 1156 | / |
| C–O–C Pyranose Ring | 1031 | 986 |
| β–Glycosidic | 899 | 909 |