Overdependence on the conventional sources of oil has led to a shortage of edible oils for both domestic and industrial uses. This has called for search for newer sources of oil with better quality to boost industrial activities. The aim of this work is to determine the physicochemical properties of oil extracted from the selected underutilized oilseeds. Oil from cassava seed, African star apple, alamanda seed, tiger nut, and water melon seed was extracted with petroleum ether. Physicochemical properties of oil were determined, proximate compositions of the oil seeds were determined using the AOAC methods while the fatty acid profile of the oilseeds were determined using gas chromatography. Cassava seed has the highest value for protein(23.28±0.08%) and ash content (8.40±0.02). Alamanda seed is a rich source of oil having a proximate composition of(43.30±0.03%). Saponification value of the oilseeds for cassava seed, African star apple, alamanda seed, tiger nut, and water melon are 112.63±2.87MgKOH/g, 196.13±4.01MgKOH/g, 281.17±3.55MgKOH/g,127.93±2.00MgKOH/gand 250.33±2.02MgKOH/g respectively. Iodine value for the oil seed is>100g except in cassava seed having a value of 87.24±2.80g/100g. The peroxide value of the oil seeds falls within the recommended value having a value less than 10Meq/g. The fatty acid profile of the oilseeds shows that they contain oilthat is rich in polyunsaturated fats likerecinoleicand linoleic acid as well as monounsaturated fats such as oleic acid and saturated fats such as stearic acid and palmitic acid. The underutilized seed in this study could be a cheap source of oil for domestic and industrial uses for the production of soaps, detergents, cosmetics, animal feed production and lubricants for machines.
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