Review Article
Structural Characterization of Lignin and Its Degradation Products with Spectroscopic Methods
Table 3
Assignments of signals in
1H NMR spectrum to typical functional groups in lignin (in CD
3Cl) [
25,
31].
| | Chemical shift/ppm | Assignments |
| | 9.7–9.9 | Cinamaldehydes and benzaldehydes | | 6.7–7.1 | Aromatic-H in guaiacyl | | 6.2–6.7 | Aromatic-H in syringyl | | 5.8–6.2 | Benzylic OH in β-O-4 and β-1 | | 4.9–5.1 | Carbohydrates | | 3.3-4.0 | Methoxyl | | 3.0–3.1 | Hβ in β-1 | | 2.2–2.4 | Phenolic OH | | 1.6–2.2 | Aliphatic OH |
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