Effect of photo-oxidized Soybean Oil and Palm Olein on some biochemical parameters of Rats

Abstract

The objective of this study was to determine the influence of sunlight on the quality of soybean oil (SBO) and palm olein (POL) and the consequences of their consumption on some biochemical parameters of rats. SBO and POL were purchased from the local market and divided into five (5) groups of 200 g each and transferred in transparent glass containers. One group served as control and the others exposed to sunlight 8 h/day for 15, 30, 45 and 60 days respectively. Their qualities were tested by measuring the oxidation parameters. Oil samples of days 0, 30 and 60 were administered to sixty male rats aged 28 days and some biochemical parameters evaluated. Results showed significant increase in the peroxide (PV) (8.83–62.63 meq O2 /Kg), thiobarbituric acid (TBA) (3.58–19.99 ppm), acid (AV) (0.27–0.56 % oleic acid) and a decrease in iodine value (IV) (50.45–67.57 g I2 /100 g) in photooxidized oils. Biochemical analysis revealed significant increase in Alkaline Phosphatase (ALP) (145–194 U/L), Alanine aminotransferase (ALT) (30–61 U/L), total cholesterol (16–59 mg/dl) and low density lipoprotein (LDL) (4–32 mg/dL) and triglycerides (50–83 mg/dl) in rats fed with photo-oxidized oils compared to control groups. Oils should not be exposed to sunlight.

Keywords

• Sunlight
• Soybean oil
• Palm olein
• Photo-oxidation
• Quality
• Biochemical parameters