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| Compounds | Bonding type | Number of waves (cm−1) | Structural polymers |
|---|---|---|---|
| H2O | O–H | 3300–3750 | Hemicelluloses, cellulose |
| CH3COOH | C–O (esthers); β-O-4 (lignin) | 1050 | Lignin, hemicellulose |
| CO | C O | 2181 | Hemicellulose |
| H2O | O–H (alcohol) | 1442 | Hemicellulose, cellulose |
