Linked to 2nd overtone of CH-stretching and may correspond to CH3 groups of wood constituents such as lignin assigned to spectra and CH, CH2 groups of cellulose
2
1440
Arises from 1st overtone of C-H stretching and C-H deformation in lignin
3
1447–1491
Linked to 1st overtone of O-H stretching in phenolic lignin, glucomannan, and semicrystalline regions in cellulose, intramolecular H-bond of cellulose
4
1922–1928
Related to O-H asymmetric stretching and O-H deformation of the water molecule; this is expected, as the moisture content was different in the specimens
5
2085–2113
Relates to O-H and C-H stretching and deformations in cellulose and xylan molecules
6
2277
Relates to O-H plus C-C stretching and/or C-H stretching and deformation in cellulose; this peak overlaps the peak at 2236 nm related to lignin via C-H stretching and C-H2 deformations
7
2331
Related to C-H stretching and C-H deformation in hemicellulose and xylan molecules