Table 2.

Tentative assignment of principal absorptions at biofingerprint region (900–1800 cm⁻¹) [23], [35].

Band	Assignment
970 cm−1	${\nu }_{\text{s}}\left({\text{R–PO}}_4^{2-}\right)$ of phosphorylated proteins
1030 cm−1	Glycogen
1080 cm−1	${\nu }_{\text{s}}\left({\text{PO}}_2^{-}\right)$ of phosphodiester groups of nucleic acids
1155 cm−1	ν(C–O) of carbohydrates
1225 cm−1	${\nu }_{\text{as}}\left({\text{PO}}_2^{-}\right)$ in RNA and DNA
1260 cm−1	Amide III: ν(C–N) in proteins
1550 cm−1	Amide II: δ(N–H) coupled to ν(C–N)
1650 cm−1	Amide I: ν(C O)
1750 cm−1	ν(C C) of lipids

ν_s = symmetric stretching; ν_as = asymmetric stretching; δ = bending.