Table I.

Vibrational Frequencies (in cm⁻¹) and Assignments of Peaks Found in the Spectra of Cells

3300	Amide A (N–H stretching mode, peptide linkage)
2950	CH3 antisymmetric stretching mode
2920	CH2 antisymmetric stretching mode
2880	CH3 symmetric stretching mode
2850	CH2 symmetric stretching mode
1735	>C=O stretching mode, ester linkage
1690–1620	Amide I (>C=O stretching mode, peptide linkage)
1570–1530	Amide II (C–N stretching mode, peptide linkage)
1468–1455	CH3/CH2 antisymmetric bending mode
1397	–COO– symmetric stretching
1379	CH3 symmetric bending mode
1340–1240	Amide III (coupled N–H/C–H deformations)
1237	O–P=O antisymmetric stretching mode $({\text{PO}}_2^{-})$
1150	C–O stretching, C–O–H bending modes (carbohydrates, mucin)
1083	O–P=O symmetric stretching mode $({\text{PO}}_2^{-})$
1063	–CO–O–C symmetric stretching mode
1050	C–O stretching mode (carbohydrates, mucin)
1004	Phenylalanine ring breathing mode
968	C–O–P phosphodiester residue (DNA)