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Table 5 Assignment of functional groups and their corresponding polymers in pretreated corncob

From: Delignification of corncob via combined hydrodynamic cavitation and enzymatic pretreatment: process optimization by response surface methodology

Wavenumber

Functional groups

Corresponding polymer

3340

O–H stretch

Lignin

2833

C–H stretch

Lignin

1634

Aromatic ring vibration

Lignin

1509

C=C

Lignin

1422

CH2

Lignin

1321

C–O–CH vibration

Lignin

1247

C–O stretching

Syringyl units

1157

C–O–C asymmetrical stretching

Hemicellulose (xylose)

1031

C–O,C=C,C–C–O stretching

Cellulose, hemicellulose and lignin