PHYSICOCHEMICAL AND ANTIOXIDANT PROPERTIES OF PALM OIL SAMPLES OBTAINED FROM KWALI AREA COUNCIL, ABUJA, NIGERIA.

O. Idoko, S.A. Emmanuel, P.A. Obigwa, A.E. Fadeyi

Abstract


Four palm oil labeled as (K1, K2, K3 and K4) were collected randomly from a local market in Kwali area council, Abuja. Physicochemical analysis was carried out on the oils to ascertain the qualities of the oil samples. The antioxidant properties were measured in terms of radical scavenging ability using the stable radical 1,1-diphenyl-2-picrylhydrazyl (DPPH) with a concentration of 2.0, 1.5, 1.0, 0.5 and 0.25 mg/ml. The physicochemical analysis results showed that acid value ranged between 20.58-29.87 mgKOH/g; saponification values between (189-210) mgKOH/g; iodine values between (35.35-48.14) wijs; peroxide values between(4.80-32.11) meq/Kg and moisture content between(0.34-1.29)% for the oils. The antioxidant measurement showed K1, K3 and K4 having their highest activities at the concentration of 1.5 mg/ml, while K2 has high activity at 2.0 mg/ml. The high acid values of the four oil samples is an indication that the oil has been subjected to series of oxidation. The high peroxide value of K1 (32.11) meq/Kg is an indication that the oil has become rancid and not safe for consumption.

Keywords: Palm oil, quality assessment, antioxidants, physicochemical properties, adulteration


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Chemical Society of Nigeria