Fusarium concolor X4 Pretreatment Suppresses Light-Induced Yellowing of High-Yield Pulp
Table 3
Signal assignment in FTIR-ATR spectra of poplar CTMP and changes in spectra intensity before and after treatment of 2 days and 6 days using F. concolor X4.
Wavenumber (cm−1)
Band assignment
Relative intensitya
2 days
6 days
Control
Sample
Control
Sample
3333–3336
O-H (–OH groups) stretching vibrations
1.37
1.50
1.37
1.53
2896–2899
C-H (-CH2-,-CH3) stretching vibrations
0.62
0.64
0.62
0.65
1593
Aromatic skeletal stretching vibrations
0.81
0.84
0.82
0.87
1503
Aromatic skeletal stretching vibrations
0.70
0.73
0.71
0.73
1459
C-H- deformation; -CH3 and -CH2- asymmetric vibrations
0.86
0.89
0.89
0.90
1422–1429
Aromatic skeletal vibrations
1
1
1
1
1315–1317
CH2 vibrations in cellulose and hemicellulose
1.09
1.08
1.10
1.06
1204–1231
C-O (syringyl) bending vibrations
1.06
0.99
1.03
0.96
1160
C-O-C stretching in cellulose and hemicellulose
1.61
1.54
1.51
1.44
1103–1108
O-H association band in cellulose and hemicellulose
2.61
2.58
2.60
2.53
1052-1053
C-O stretching vibrations in cellulose and hemicelluloses
5.22
4.97
5.20
4.86
1030-1031
Hemicellulose or G lignin vibrations
6.25
5.90
6.23
5.63
896-897
Anomeric carbon (C1) vibrations in hemicellulose
1.19
1.03
1.21
1.03
aRelative intensity was the ratio of the intensity of a given band to the intensity of the reference band at 1422–1429 cm−1.
