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Table 1 Assignments of FTIR peaks in lignin samples [23, 24]

From: Effect of alkaline lignin modification on cellulase–lignin interactions and enzymatic saccharification yield

Wavenumber/cm−1 Assignments
1616, 1512, 1423 Aromatic skeletal vibrations
1708 Non-conjugated carbonyl groups
1649 Conjugated carbonyl groups
1272 The C–O stretching of G type lignin
1043 S=O stretching vibration
834 p-hydroxyphenyl units (H unit)
536 C–S stretching vibration