Table 1 Assignments of the IR absorption bands are evidenced by the loading plot of PC1 vs PC2, as illustrated in Fig. 4
Wavenumber [cm−1] | Functional group | Compound | Reference |
|---|---|---|---|
3380-3330 | νOH | Water/Lipids | |
2951 | νCH3 | Lipids | |
2920 | νCH | Lipids | |
2852 | νCH2 | Lipids | |
2515 | 2νCO32− | Carbonates | |
1795 | 2δCO32− | Carbonates | |
1740 | νC=O | Lipids | |
1701 | νC=O | Lipids | |
1652 | δOH | Water/lipids | |
1558 | νCOO- | Lipids | |
1462 | scissoring CH2 | Lipids | |
1408–1394 | νCO32− | Carbonates | |
1247 | δ out of plane CH2 | Lipids | |
1160 | νC–O | Lipids | |
1008–1040 | νSiO | Silicates | |
778 | SiO | Silicates | |
798 | SiO | Silicates | |
876 | δCO32− | Carbonates | |
713 | δCO32− | Carbonates |
