Table 1.

Tentative peak assignments for human skin tissue Raman spectra. Greek letters denote the type of vibrational mode (υ, stretching; δ, deformation).

Wavenumber (cm−1)	Tentative Peak Assignment	Refs.
720	υ (C-N) nucleotide peak or lipid/DNA	[18,19]
753	Symmetric breathing of tryptophan	[18,19]
853	υ (C-C) collagen proline ring	[10,20,21]
936	υ (C-C) collagen backbone/proline ring	[10,20,21]
1002	υ (C-C) aromatic symmetric ring breathing of phenylalanine	[22,23]
1032	C-N in-plane bending of phenylalanine	[24,25]
1040	υ (S-O) cysteic acid	[26,27]
1248	υ (CN) and δ (NH) amide III of collagen: proline rich	[11,28]
1305	δ (CH2) lipids/ceramide,	[22,29]
1327	CH3/CH2 wagging of nucleic acids	[19,30]
1450	δ (CH2) scissoring of proteins and lipids	[20,21,30]
1654	υ (C=C) Amide I (protein/lipid)	[28,29]
1661	υ (C=O) Amide I (collagen)	[21]