Table 2. e00094

Table 2. The absorption bands of lipids in the IR spectra of saliva.

Absorption Band, cm^-1	Literary Data, cm^-1[14, 15]	Types of Vibrations	Spectrum Interpretation
970	967-972	ν_asC=С	trans conformation of the carbon skeleton
1082	1075-1090	ν_sPO₂	phospholipids
1180	1160-1179	ν_asC-O	ester bonds in lipids
1400	1400	νC=O + δ_sCH₃	fatty acid aliphatic chains
1460	1454–1473	δCH₂, δ_asCH₃	fatty acid aliphatic chains
1735	1720–1740	νC=O	lipids, cholesterol esters, fatty acid oxides
2850	2847–2855	ν_sCH₂	lipids, long chain fatty acids
2875	2872–2875	ν_sCH₃	lipids, fatty acids
2930	2915–2924	ν_asCH₂	lipids, long chain fatty acids
2950	2955–2960	ν_asCH₃	lipids, cholesterol esters, fatty acids

Note. ν - stretching vibrations (ν_s - symmetric, ν_as - asymmetric), δ - deformation vibrations