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 |