Journal of Spectroscopy / 2017 / Article / Tab 4

Review Article

Structural Characterization of Lignin and Its Degradation Products with Spectroscopic Methods

Table 4

Assignments of signals in 13C NMR spectrum to functional groups in lignin [31, 38, 49, 71].

Chemical shift/ppmAssignments

167–178Unconjugated -COOH
162–168Conjugated -COOH
140–155C3, C4 aromatic ether or hydroxyl
127–140C1, aromatic C-C
123–127C5, aromatic C-C
117–123C6, aromatic C-H
114–117C5, aromatic C-H
106–114C2, aromatic C-H
78–90Aliphatic Cβ-O
67–78Aliphatic Cα-O

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