Table 1. Band assignments for the IR spectra [26], [27].

Wavenumber (cm–1)	Spectral assignments
966	C-O stretch deoxyribose and C-N+-C stretch (mainly from DNA)
996	C-O stretch ribose (mainly from RNA)
1030	C–O stretch (mainly from glycogen)
1080	PO2 – symmetric stretch in glycogen and nucleic acids
1152	CO–O–C asymmetric stretch (mainly from glycogen)
1171	CO-O-C asymmetric stretch from ester bonds in cholesteryl esters
1238	PO2 – asymmetric stretch (mainly nucleic acids)
1397	COO- symmetric stretch in fatty acids and amino acids
1451	CH2 bending (mainly from lipids)
1542	N–H bending and C–N stretch in proteins (Amide II)
1648	C═O stretch in proteins (Amide I)
1741	C═O stretch in triglycerides and cholesterol esters
2856	CH2 symmetric stretch (mainly from lipids)
2875	CH2 symmetric stretch (mainly from lipids)
2926	CH2 asymmetric stretch (mainly from lipids)
2956	CH3 asymmetric stretch (mainly from lipids)
3012	= C-H stretch (mainly from unsaturated lipids)