Structural Analysis of Alkaline Pretreated Rice Straw for Ethanol Production

Table 2

Assignment and description of peaks corresponding to functional groups of biomass components by FTIR analysis.

Wave number (cm^−1)	Functional group assignment	Related biomass component
3400–3200	O-H stretching (hydrogen bond)	Cellulose
2910	C-H stretching	Cellulose
1720	C=O stretching	Hemicellulose/lignin
1650–1515	C=C aromatic skeletal vibration	Lignin
1465	C-H deformation	Lignin
1432	CH2 bending	Cellulose
1375	C-H deformation	Cellulose
1320	Syringyl ring C-O stretching	Change in lignin monomer
1268	Guaiacyl ring C-O stretching	Change in lignin monomer
900	C-H out of plane	Cellulose