Refining of rice bran oil is necessary to remove unwanted ingredients that affect the quality, flavor, and stability of the oil. Here are the reasons why it’s necessary:
Removal of Free Fatty Acids (FFA): Rice bran oil contains a high amount of FFA due to the lipase enzyme in the rice bran1. These FFAs need to be removed to prevent a faster rate of oil degradation.
Elimination of Impurities: The crude rice bran oil contains impurities, waxes, and gums1. These need to be removed to improve the oil’s appearance and taste.
Deodorization: The refining process also includes deodorization to remove any unpleasant odors from the oil.
Preservation of Nutrients: The physical refining process is used for rice bran oil because it helps retain oryzanol, a nutrient that supports heart health.
Improvement of Stability for High-Temperature Cooking: Refined rice bran oil is suitable for high-temperature cooking methods such as stir frying and deep frying.
The rice bran oil refining process typically involves stages like degumming, water washing, vacuum drying, bleaching, de-waxing, and deodorization with deacidification.