EXTRACTION AND CHARACTERIZATION OF VEGETABLE OIL FROM THEVETIA PERUVIANA AND JATROPHA CURCAS SEEDS

J M Jabar, L Lajide, I O Bakare, M T Oloye

Abstract


Thevetia peruviana and Jatropha curcas oils were cold extracted from their seeds using petroleum ether as extracting solvent. Characterization of the extracted vegetable oils showed that oil yield was greater than 50 % from both seeds. The moisture content of the extracted vegetable oils was less than 0.1 %, while their specific gravities were 0.908 and 0.907 for T. peruviana and J. curcas oil respectively. The refractive index and viscosity of the oils are 1.440 and 152.9 mPa.s for T. peruviana oil, 1.465 and 156.8 mPa.s for J. curcas oil respectively. The chemical properties of the oils showed free fatty acid values of the T. peruviana and J. curcas oil to be within the range of other vegetable oils. The iodine values of the oils confirmed the liquid nature of the oils. The results obtained revealed that the extracted vegetable oils are of good quality for cosmetics, soap, paint, and polyurethane productions, because of their high yield among other properties. The vegetable oils are not good for cooking, because of their inedible nature (free fatty acid is greater than 4 mgKOH/g in J. curcas oil and T. peruviana oil contains toxic cardiac glycoside).

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