| Absorption ranges (cm−1) |
Functional groups |
Attributions |
| 3200 - 3640 |
Hydroxyls (OH) of alcohols, phenols and carboxylic acids |
Lignin and cellulose |
| 2840 - 3000 |
CH2 and CH3 of alkyl, aliphatic and aromatic groups |
Extractables and cellulose |
| 1540 - 1870 |
Carbonyls (C=O) of ketones, carboxylic acids and acetyl groups |
Hemicellulose |
| 1516 - 1610 |
(C=C) of aromatic rings |
Lignin |
| 1330 - 1420 |
Phenol hydroxyls (OH) |
Lignin and carbohydrates |
| 1200 - 1400 |
Hydroxyls of phenols and (C-O-C) in aryl alkyl ether |
Hemicellulose and lignin |
| 1085 - 1150 |
(C-O-C) in pyronose ring |
Cellulose |
| 675 - 900 |
(C-H) in lignin aromatic rings |
Lignin |