Vibration modes Standard chitin (cm-1) Chicken feet chitin OH- out of Plane bending 697.63 684.96 NH-out of plane bending 748.28 751.45 Ring Stretching 893.93 890.77 CH3 wagging alone chain 954.09 950.92                   CO-stretching 1030.08 1020.58                   CO-stretching 1074.41 1071.24 Asymmetric in phase ring stretching 1115.57 1118.73 Asymmetric bridge O2 stretching 1156.73 1159.89 Amide III band and CH2 wagging 1315.04 1315.04 CH bending and symmetric CH3 deformation 1387.67 1384.7 CH2 bending and CH3 deformation 1419.53 1419.53                    Amide II band 1558.84 1555.67                    Amide I band 1653.83, 1634.83 1650.66, 1634.83 Symmetric CH3 stretching and asymmetric CH2 stretching 2923.48 2920.32                   NH stretching 3113.46 3110.29                   OH stretching 3439.58 3445.91                   CH stretching 2888.65 2885.49

Table 3: FT-IR spectral values of the main bands obtained for the standard chitin and extracted chitin from chicken feet.

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