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Table 1 FTIR bands of chitin samples isolated from bat guano and commercial chitin

From: Bat guano as new and attractive chitin and chitosan source

Functional group and vibration modes Classification Wavenumber (cm−1) frequency
Bat guano Commercial chitin
O–H stretching - 3437 3437
N-H stretching - 3263,3105 3261-3103
CH3 sym. stretch and CH2 asym. stretch Aliphatic compounds 2921 2932
CH3 sym. stretch Aliphatic compound 2853 2862
C = O secondary amide stretch Amide I 1656 1655
C = O secondary amide stretch Amide I 1622 1621
N–H bend, C–N stretch Amide II 1554 1553
CH2 ending and CH3 deformation - 1411 1428
CH bend, CH3 sym. deformation - 1376 1375
CH2 wagging Amida III, components of protein 1308 1311
Asymmetric bridge oxygen stretching - 1154 1154
Asymmetric in-phase ring stretching mode - 1115 1115
C–O–C asym. stretch in phase ring Saccharide rings 1068 1069
C–O asym. stretch in phase ring - 1012 1020
CH3 wagging Along chain 952 951
CH ring stretching Saccharide rings 899 897