TABLE 1.

Assignments for prominent Raman shifts arising from molecular vibrations in cellular lipids

Raman shift (cm−1)	Lipid assignment
717	Choline headgroup: CN+(CH3)3 stretch
875	C-C-N+ symmetric stretch (phosphatidyl ethanolamine)
1062, 1122	Out-of-phase and in-phase modes of all-trans chain
1082	Gauche conformation
1266	C=C-H in-plane bend of the cis -CH=CH- linkage
1301	In-phase CH2 twisting mode
1449	CH bending modes, including CH2 scissors and CH3 degenerate deformation of hydrocarbon chains
1656	C=C stretch of the cis -CH=CH- linkage of unsaturated lipid chains
1740	Carbonyl C=O ester stretch