Table 3 FTIR spectral data for Ipomea pes-caprae (IPC) with corresponding peak assignment

Untreated

893

β-glycosidic linkages between the xylose units

1027

C-O stretching in lignin; C₆-O₆H stretching in cellulose

1164

aromatic C-H in plane deformation in guaiacyl ring

1264

G ring breathing with carboxyl stretching

1370

phenolic OH and aliphatic C-H in methyl group. Attributed to cellulose

1538

aromatic skeletal vibration in lignin

1700–1720

beta-keto structures in lignin

2365

CH₂ and CH symmetrical stretching in cellulose

2913

C-H stretching in lignin

3424

O-H stretching in lignin

Pretreated

1265

G ring breathing with carboxyl stretching

2366

CH₂ and CH symmetrical stretching in cellulose

913

C₆-O₆H stretching in hemicellulose

Saccharified with purified xylanase

1029

C₆-O₆H stretching dominant in cellulose

1160

C-O-C stretching in cellulose and xylan

1722

C = O stretching in acetyl group and carboxylic acid in hemicellulose

2918

C-H stretching in cellulose

Saccharified with crude xylanase

1172

aromatic C-H deformation in guaiacyl ring

2000–2400

asymmetric C ≡ C stretching