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SUMMARY
The double bonds found in fat or oil plays a role in autoxidation. Oils with high degree of unsaturation are most susceptible to autoxidation. The best test for autoxidation (oxidative rancidity) is determination of the peroxide value. Therefore, from table 5, coconut oil which has a peroxide value of 4 because of its high content of saturated fatty acids and low unsaturated fatty acids which makes it highly resistant to oxidative rancidity. This quality makes it suitable for storage without deterioration. But the peroxide value of palm kernel oil is 28, which is considerably much higher than those obtained from coconut oil and castor oil. This indicates that the degree of spoilage or rancidity is more than that of coconut and castor oil which can be attributed to the following conditions such as exposure to atmospheric oxygen and long shelf life of the oil.
