Abstract
The oxidative stability of palm oil and that of its blends were studied by the AOM method. Crude palm oil (CPO). refined, bleached and deodorized palm oil (RBD palm oil), refined palm kernel oil (RPKO) showed increased oxidative stability after being washed with aqueous sodium hydrogensulfite (5% wt/vol). Washing with hydrogensulfite failed to increase this parameter for soybean oil effectively. However, when soybean oil was blended with CPO, RBD palm oil and RPKO, increased oxidative stability was noted. A relationship between the degree of unsaturation and oxidative stability was also observed as follows : a higher degree of unsaturation lowered the oxidative stability and washing with hydrogensulfite was ineffective for increasing it. The effects of tocopherol and carotene on the oxidative stability of palm oil blends were also examined.
