Frying Stability Evaluation of Rice Bran Oil Blended with Soybean, Mustard and Palm Olein Oils

摘要

Refined rice bran oil (RBO) was blended with PUFA rich Soybean oil (SBO), MUFA rich Mustard oil (MO) and SFA rich Palm Olein oil (POO) to make a blend that had sufficient amount of Omega-3 fatty acid by mixing two or more oils in the ratio of 60:40 and 60:20:20 respectively. RBO and its blends were subjected to deep fat frying of potato chips at 180±1°C for 24h. Oil samples were withdrawn after every four hours of frying and evaluated for peroxide value (PV), p-Anisidine value (p-AV), Total polar component (TPC) and oil stability index (OSI) for the RBO and its blends. In general, frying stability of RBO was improved by the blending, the Omega-6/Omega-3 ratio of the blend of RPM and RSM was in the recommended range (1:5-10), and in both cases it was observed to be 1:6. The OSI of RBO deteriorates 66% and it improved by blending with POO and it decline only 53% and 54% for the blend RP and RPM respectively. It was concluded that the blend having more than two oils (RBO+PO+MO) was better in oxidative stability, nutritional value and also contain sufficient amount of Omega-3 fatty acid than that of the RBO and its other blends.