Structural Changes of Lignin after Liquid Hot Water Pretreatment and Its Effect on the Enzymatic Hydrolysis

Table 2

Assignments of characteristic peaks in FTIR spectrogram.

Wavenumber (cm^−1)	Assignments of characteristic peaks
2937	C-H stretching vibrations in methyl and methylene
1597	Stretching vibrations of aromatic skeleton and C=O
1514	Vibrations of aromatic skeleton
1463	C-H deformations in methyl
1427	Plane deformation of C-H in aromatic skeleton
1271	Stretching vibrations of guaiacyl ring and C=O
1217	Stretching vibrations of C-C, C-O, and C=O
1032	Plane deformations of aromatic C-H, C-O deformations in primary alcohols, and C=O stretching vibrations
856	C-H vibrations in the positions of 2, 5, and 6 out of the plane of guaiacyl units