Study On The New Method Of Oryzanol Production With Solvent Extraction

Currently the method of alkali-solution and acid isolation is extensively used for the oryzanol production. In order to improve the yield of oryzanol and refining efficiency of rice bran oil, advanced technology with solvent extraction for oryzanol production was developed in this paper.The solubility of oryzanol in solvent at different pH was systematically studied, then the extracting pH was determined; meanwhile, the solubility of oryzanol in the same solvent at different temperature was studied and the extracting temperature was concludied. The relationship between the temperature of physical refining and the losses of oryzanol pyrolysis was also determined: temperature 250~255℃, time 20min, degree of vacuum less than 500Pa. The combination of physical refining with extracting oryzanol production was firstly done.The extraction was done by counter current 2~3 time sofcontact operations and 15~35 times of methanol(W/W) were added according to the result of the test. The method of solvent extraction to produce oryzanol make the total yield of oryzanol from 35%~40% by the old method mentioned above improved to over 70%. The purity of oryzanol reached more than 99%, conformed to the standard of high grade product. The yield of refined rice bran oil in- creased more 5% than that with old method. Application of physical refining the process of rice branoil with high acid value does not produce soapstock and decrease environment pollution.