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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