Olio di riso
Separazione del gamma orizanolo dall’olio di riso
The isolation of oryzanol from crude rice bran oil (RBO) was achieved by a two-step crystallization process. In the first crystallization, oryzanol was concentrated in the liquid
phasealong with free fatty acid (FFA), monoacylglycerol (MG), squalene, tocols, and phytosterols, whereas the solid phase contained mainly triacylglycerol (TG) and steryl esters. Oryzanol-rich product obtained from the first crystallization was subjected to the second crystallization where the oryzanol-rich product was kept at room temperature (20.5 ± 1.5 °C) for 24 h. Hexane was added as anti-solvent to the oryzanol-rich product and kept at 5 ± 1 °C for another 48 h. Parameters that affect the isolation of oryzanol from crude RBO were systematically investigated. Under optimal operation conditions, oryzanol with purity and recovery of 93-95% and 59%, respectively, was obtained from RBO with an initial FFA content of ca. 5%.
Bioresour Technol. 2008 Jul 19.