Table 5 FTIR-band assignments for the lignocellulosic components
Wavenumbers (cm−1) | Functional group | Polymer |
|---|---|---|
1157 | C–O–C asymmetrical-stretching vibration | Cellulose and hemicellulose |
1369 | CH3 symmetrical angular vibration | Cellulose and hemicellulose |
1373 | C–H deformation | Cellulose and hemicelluloses |
1415 | COOH groups symmetrically stretching vibration | Cellulose and hemicellulose |
1425 | CH2 scissor vibration | Cellulose and hemicellulose |
1430 | CH2 bending vibration in olefin | Cellulose and hemicellulose |
1457 | CH3 asymmetrical angular vibration CH2 bending vibration | Cellulose and hemicellulose |
1504 | C=C-stretching vibration in aromatic rings | Lignin |
1508, 1605 | Aromatic skeleton vibration | Cellulose |
1610 | C=C-stretching vibration COOH groups stretching vibration in aromatic ring | Cellulose, hemicellulose and lignin |
1735 | C=O-stretching vibration in ester groups | Hemicellulose |