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Table 1 Signal assignment and relative intensities of lignin fractions from natural poplar variants in FT-IR spectra

From: A structured understanding of cellobiohydrolase I binding to poplar lignin fractions after dilute acid pretreatment

No. Assignment Wavenumber (cm−1) H 1 H 2 H 3 L 1 L 2 L 3
1 Hydroxyl group 3410 0.49 0.68 0.75 0.57 0.73 0.73
2 C–H stretching 2938 0.47 0.67 0.64 0.65 0.89 0.85
3 C=O in unconjugated ketone 1738 0.13 0.54 0.69 1.29 2.36 2.25
4 Aromatic ring 1596 0.83 0.98 1.00 0.86 0.93 0.95
5 Aromatic ring 1513 1.00 1.00 1.00 1.00 1.00 1.00
6 C–H deformation 1459 1.14 1.27 1.27 1.24 1.37 1.36
7 Aromatic ring 1424 0.95 1.06 1.10 1.10 1.34 1.35
8 Syringyl and condensed guaiacyl 1324 1.01 1.06 1.06 1.05 1.06 1.08
9 C–O stretching 1215 1.39 1.66 1.66 1.85 2.41 2.37
10 Aromatic C–H deformation in syringyl 1112 1.89 1.96 2.00 1.85 1.76 1.78
11 C–O–C stretching 1030 0.91 1.29 1.39 1.01 1.14 1.10
  1. The relative intensity was calculated as the ratio of the intensity of the band to the intensity of band at 1513 cm−1