Wavenumber/cm−1 | Assignment | Representative compounds |
3415.69 | -OH vibration and N-H stretching vibration | Carbohydrates including cellulose, hemicellulose, and lignin and water |
2926 | Symmetric or asymmetric stretching vibrations of C-H in -CH3 and -CH2 | Polysaccharides, lignin, fatty acids and saturated hydrocarbons |
1737 | Stretching vibration of C=O in non-conjugated ketones, carbonyl groups and esters | Polysaccharides, lignin, and hemicellulose |
1654 | Stretching vibration of C=O in p-substituted conjugated aromatic groups | Lignin |
1617 | Stretching vibration of C=O and skeletal vibration of aromatic groups | Lignin |
1516 and 1513 | Deformation of N-H and stretching vibration of C=N | Aminos and lignocellulose |
1445 | Bending vibration of C-H and skeletal vibration of benzene ring | Lignin and polysaccharides Lignin |
1236 and 1261 | Stretching vibration of CO-OR and Ph-O | Acetoxy group in hemicellulose and lignin |
1049 | Asymmetric stretching vibration of Si-O-Si and stretching vibration of C-O | Silicic compounds cellulose, polysaccharides, lignin, and hemicellulose |