Table 1 The assignments of the spectral bands labelled in Fig. 2.
Band No | Wavenumber (cm−1) | Definition |
|---|---|---|
1 | 3010 | Olefinic ν(HC = CH) of unsaturated fatty acids [26, 27, 32, 33, 38] |
2 | 2957 | νas(CH3): equal contribution from lipids and proteins [26, 32, 33, 38, 39, 40] |
3 | 2923 | νas(CH2): mainly lipids [26, 27, 28, 30, 32, 33, 38, 39, 40] |
4 | 2873 | νs(CH3): mainly proteins [26, 27, 28, 32, 33, 38, 39] |
5 | 2852 | νs(CH2): mainly lipids [26, 27, 28, 30, 32, 33, 38, 39, 40] |
6 | 1740 | ν(C = O) carbonyl ester of lipids, cholesterol esters, triglycerides [28, 30, 32, 33, 38, 39, 40, 41, 42] |
7 | 1643 | Amid I of proteins, %80 ν(C = O), %10 δ(N-H), %10 ν(C-N) vibrations [27, 28, 30, 32, 33, 39] |
8 | 1542 | Amid II of proteins, %60 δ(N-H), %40 ν(C-N) vibrations [27, 28, 30, 32, 33, 39] |
9 | 1453 | δ(CH2) of lipids [26, 27, 28, 39, 41] |
10 | 1399 | νs(COO−) of fatty acids and protein side chains [28, 33, 39] |
11 | 1340 | CH2 side chain vibrations of collagen [21, 26, 29, 37] |
12 | 1311 | Amide III: proteins, 40% δ(N-H), 40% ν(C-N), 20% ν(C-C) vibrations [28, 33, 41] |
13 | 1236 | νas(PO2−) of phospholipids and nucleic acids [24, 28, 32, 33, 39] |
14 | 1079 | νs(PO2–) of nucleic acids and phospholipids [21, 24, 28, 32, 33, 39] |
15 | 1035 | ν(C–O) of carbohydrates, glucose [26, 28, 33] |
16 | 990 | RNA backbone vibrations [33, 41, 40, 42] |
17 | 970 | νs(PO4–2) stretching mode of dianionic phosphate monoesters of phosphorylated proteins or nucleic acids [23, 38, 40, 41] |
