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Table 2 Assignment of signals in 1 H-NMR spectra of lignin

From: Differences in the adsorption of enzymes onto lignins from diverse types of lignocellulosic biomass and the underlying mechanism

ppm Assignments
10.4 H in -OH
7.4 H in G
6.9 Hα (α,β in conjugated double bonds)
4.8 Hγ (β-5, β-1, β-β, β-O-4)
4.0 Hβ (β-O-4)
3.8 HOMe (aromatic)
3.6
3.3 H2O
2.6 DMSO
2.0 H in aliphatic -OH
1.9
1.2 H in aliphatic -OH of high-shielding effect
1.1
0.8
0.0 Unknown
  1. DMSO, dimethyl sulfoxide; G, guaiacyl; H, hydroxyphenyl; NMR, nuclear magnetic resonance.