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Characteristic FTIR absorption bands (cm⁻¹) of Pure Lutein, Blank-NLP, and Lutein-NLP.
| Functional Group | Pure Lutein (cm⁻¹) | Blank-NLP (cm⁻¹) | Lutein-NLP (cm⁻¹) |
|---|---|---|---|
| O–H Stretching (Hydrogen bonding) | - | 3587 | 3587 |
| C–H Stretching (Aliphatic) | 3015 | - | 3024 |
| C = O Stretching (Ester/Carotenoid) | - | 1758 | 1780 |
| Conjugated C = C stretching | 1814 | - | 1896 |
| C–O Stretching (Fingerprint) | 1263 | - | 1263 |
