Abstract:
The present invention provides a method for preparing oryzanol from oryzanol-containing soapstock serving as a raw material, comprising the following steps: 1) alkali-alcohol thermal dissolution; 2) heat-preserved fine filtration; 3) heat-preserved ultrafiltration membrane separation; 4) heat-preserved decolourisation; 5) acid neutralisation and filtration; 6) washing; and 7) drying. The temperatures of the step 1) to the step 4) are controlled at 50-60°C. The present invention has the characteristics that the method comprises a heat preservation operation at 50-60°C, membrane separation, decolourisation and washing, to finally prepare a white powdered product, and effects that the purity of oryzanol is greater than 98% and the yield is greater than 73% are achieved. The present invention does not use toxic or combustible or explosive organic solvents such as methanol, ether, hexane and solvent oil, so that the product use safety is improved; the production process is simple, has low requirements on production equipment, is easy to operate and realise, and is low in production cost and suitable for industrial production.
Abstract:
The present invention relates to a method for preparation of betulinic acid from betulin. The method comprises oxidizing betulin to betulinic and/or betulonic aldehyde with a ruthenium based catalyst catalyzed oxidation process in the presence of an oxidant, and further converting the betulinic and/or betulonic aldehyde to betulinic acid.