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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.