Table 5.

FTIR shows characteristic vibrations and translations

Authors [Reference]	Main IR characteristics							Particular characteristics
	O–H stretch N–H stretch	C–H stretch	CN stretch	C=C stretch N–H bend C=O stretch	N–O stretch	C–H bend C–N stretch C–O stretch N–H bend	C–O stretch	C–O stretch C–N stretch
Rajakumar et al. [51]	3361				1540	1399		1049
Mishra et al. [49]	3622			1699			1388	1043
Murugan et al. [52]	3280		2359					1092–1027
Jaganathan et al. [62]a	3455	2920		1639	1555	1407
Subramaniam et al. [53]	3421		2362	1641	1514	1456
Murugan et al. [55]	3416; 3402			1640/1635
Murugan et al. [56]	3479; 3402		2359					1092–1027
Dutta et al. [57]	3341–3308	~ 2800				~ 1400
Murugan et al. [63]	3273	2921/2924	2355	1728
Gandhi et al. [59]	3377	2941		1695		1417	1293	1078	700–450 Ti–O–Ti
Rotimi et al. [60]	3400			1680					500 Au–O

The table shows only selected bands discussed by the authors, ^aearthworms