Table 4.
The Main Characteristic Peaks for FT-IR Spectra of Different Samples or Chemicals
| Sample, Chemicals | Peak cm−1 | Description |
|---|---|---|
| DCP | 1243 | P=O bonding |
| 724–843 | P-O bonding | |
| 1450 | CH3 bonding | |
| 1465 | CH2 bonding | |
| Span 80 | 1000–1300 | C–O stretching |
| 2800–3000 | C-H stretching | |
| 3452 | OH stretching | |
| 1749 | CH2 bonding | |
| 1753 | C =O stretching | |
| 1497 | Aromatic ring | |
| Cholesterol | 1747 | C = O stretching |
| 2800–3000 | C-H stretching | |
| 3452 | OH stretching | |
| 1035–1378 | CH2 bending and CH2 deformation | |
| 1506 | C-C stretching in aromatic ring | |
| 1674 | C=C stretching | |
| L3B | 1165 | C–O stretching |
| 1745 | C = O stretching | |
| 2800–3000 | C-H stretching | |
| 1498 | Aromatic ring | |
| 1000–1250 | Aliphatic C-N stretching | |
| 3452 | OH stretching | |
| L | 1640–1690 | N = C bonding |
| 800 | N–H out-of-plane bending vibrations | |
| 1450–1600 | Aromatic ring of C = C | |
| 2250 | C ≡ N bonding | |
| 1000–1350 | N-C bonding | |
| 1550–1640 | N-H bonding | |
| 1600–1680 | C–C bonding | |
| L3 | 1125 | C–O stretching |
| 2200 | C ≡ N bonding | |
| 1747 | C = O stretching | |
| 2800–3000 | C-H stretching | |
| 3452 | OH stretching | |
| 1000–1250 | Aliphatic C-N stretching |
Notes: Empty niosome (L3B). Letrozole (L). Letrozole-loaded niosome (L3).