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The main peaks in the FTIR spectrum of Nigella sativa oils extracted by supercritical fluid of and cold press with their assignment.
| Oil types | Peak (cm−1) | Functional group |
|---|---|---|
| SFE-CP | 3482 | Primary amines (-NH2 groups) |
| SFE-CP | 2922, 2856 | C-H stretching vibration (aliphatic) (CH3) |
| SFE-CP | 1721 | C=O stretching vibration (ester) |
| SFE-CP | 1456, 1367.74 | C-H bending vibration (aliphatic) (CH2) |
| SFE-CP | 1166.48 | C-O stretching vibration (ester) |
| SFE-CP | 935.42, 717.35 | trans-CH=CH- |
