Abstract
Rice bran is a by-product of rice processing, obtained through the polishing of the rice grain. It presents a considerable high oil content (between 20 and 25%) and it is considered an excellent source of nutritionally beneficial compounds, such as tocotrienols, tocopherols and sterols. Batch supercritical fluid extraction (SFE) of rice bran with CO 2 was performed at different operational conditions (from 100 to 400 bar, 50 and 60 °C) and the extract yields were in the range of 20%. The next step corresponded to the deacidification of the obtained oil in a countercurrent (CC) column, where the experiments were carried out at 250 bar and 67 °C. The results have shown that the free fatty acids (FFA) removal from the crude rice bran oil (RBO) was successfully achieved. Deacidified RBO with <1% FFA could be obtained by applying the described process. To conclude this work, an industrial process has been proposed which couples batch SFE of rice bran with CC-SFE of the extracted oil obtained, in order to isolate the undesired FFA fraction from the raffinated oil, composed mainly by triglycerides (TG).
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