Table 3.
FTIR signals and corresponding assignment for a lignin isolated from M. x giganteus (Gig17, stem/leaf mixture).
| Number | Wave Number [cm−1] | Functional Group | Assignment |
|---|---|---|---|
| 1 | 3428 ± 60 | O-H | Stretching |
| 2 | 2926 ± 11 | C-H | Stretching |
| 3 | 2850 ± 6 | C-H | Stretching |
| 4 | 1708 ± 11 | C=O | Stretching |
| 5 | 1655 ± 4 | C=O | Stretching |
| 6 | 1605 ± 12 | Aromatic ring | Symmetric Stretching |
| 7 | 1514 ± 6 | Aromatic ring | Antisymmetric Stretching |
| 8 | 1460 ± 4 | C-H | Antisymmetric Deformation |
| 9 | 1424 ± 4 | C-H in O-CH3 | Antisymmetric Deformation (S mode) |
| 10 | 1398 ± 4 | C-H | Bending C-H in-plane |
| 11 | 1371 ± 15 | Aromatic skeleton | Deformation |
| 12 | 1331 ± 9 | Aromatic skeleton; C-O | Skeleton Stretching (S mode) |
| 13 | 1267 ± 2 | Aromatic skeleton; C-O | Skeleton Stretching (G mode) |
| 14 | 1225 ± 12 | C-C; C-O; C=O | Stretching (G mode) |
| 15 | 1166 ± 10 | C-H (in G) | Stretching |
| 16 | 1124 ± 2 | Aromatic C-H | In-plane Deformation |
| 17 | 1033 ± 2 | Aromatic C-H | In-plane Deformation |
| 18 | 834 ± 4 | Aromatic C-H | Out-of-plane Deformation (S mode) |