Table 5. FTIR Spectra Summary for Castor Kernel Oil and Castor Kernel Oil FAME.
| frequency (cm–1) |
||||
|---|---|---|---|---|
| reported value | experimental value | |||
| functional groups | castor kernel oil | castor kernel oil FAME | vibration mode | |
| alcohol (−OH) | 3600–3200 | 3369 | 3426 | stretching |
| alkene (=CH) | 3010 | 3005 | stretching | |
| aliphatic [alkane (−CH2)] | 2975–2840 | 2923 and 2854 | 2924 and 2854 | stretching |
| carbonyl [ester (C=O)] | 1750–1730 | 1741 | 1738 | stretching |
| methoxy [ester (C–O)] | 1300–1000 | 1162 | 1170 and 1244 | stretching |
| alkenes (C=C) | 1500–1400 | 1459 | 1439 | bending |
| aromatics (C–H) | 960–690 | 722 | 723 | out of plane |