. 2020 Dec 10;3:178. doi: 10.1038/s42004-020-00424-8

Table 1.

Assignment of the infrared bands in human blood.

Wavenumber (cm⁻¹)	Assignment
3500–3200	Water and hydroxyl (O–H stretching)^27,37
3284	Amide A (N–H stretching)^25,38,39
2958	Lipids (asymmetric stretching of CH₃)^25,27,37,39
2872	Lipids (symmetric stretching of CH₃)³⁹
1700–1600	Amide I (C=O stretching)^{25,27,37–39}
1560–1500	Amide II (N–H bending and C–N stretching)^{25,27,37–39}
1390	Lipids and proteins (symmetric bending of CH₃)^25,37
1239	Amide III (C–N stretching)^25,37,38
1082	Glucose (C–O stretching)^25,39
698	Amide IV (C–H bending)³⁹