Table 3.

FTIR bands (cm⁻¹) for commercial chitin, extracted chitin from glucose fermentation and from banana peel fermentation

Functional group	Commercial chitin	Extracted chitin from glucose fermentation	Extracted chitin from banana peel fermentation
O–H stretch	3447	3448	3423
C–H stretch	2891	2925	2921
C=O stretch of N-acetyl group (Amide I)	1660	1654	1655
N–H bend, C–N stretch (Amide II)	1559	1560	1542
CH3 in NHCOCH3 group	1379	1425	1383
CH2 wagging (Amide III)	1315	1315	1319
C–O–C stretch	1073	1072	1073