Table 2 FTIR bands of chitosan samples obtained from bat guano and commercial chitosan
From: Bat guano as new and attractive chitin and chitosan source
Wave number (cm −1 ) frequency | Vibration modes | |
|---|---|---|
Chitosan from bat guano | Commercial chitosan | |
3364 | 3361 | ν(NH2) assoc. in primary amines and ν (OH) assoc. in pyranose ring |
2920 | 2922 | νas(CH2) in CH2OH group |
2852 | 2867 | ν (C-H) in pyranose ring |
1656 | 1654 | ν (C = O) in NHCOCH3 group (Amide I band) |
1590 | 1589 | ν (NH2) in NHCOCH3 group (Amide II band) |
1421 | 1420 | δ(CH2) in CH2OH group |
1374 | 1375 | δs(CH3) in NHCOCH3 group |
1315 | 1317 | δ (C-H) in pyranose ring |
1259 | 1259 | Complex vibrations of NHCO group (Amide III band) |
1150 | 1149 | ν s(C-O-C) (glycosidic linkage) |
1060 | 1060 | νas(C-O-C) (glycosidic linkage) |
1024 | 1024 | ν (C-O) in secondary OH group |
987 | 986 | ν (C-O) in primary OH group |
891 | 892 | Pyranose ring skeletal vibrations |