Refinement of rice germ oil and analysis of its physico and chemical properties

After dewaxing, degumming, decolorization, deacidification and deodorizing, the refined oil was obtained from rice germ crude oil.The optimization of conditions for the degumming process by the method was performed using orthogonal array design.The optimal degumming conditions were found to be:reaction temperature 45℃, addition of phosphoric acid 0.2%, addition of water 6%, reaction time 40min.Moreover, adsorbents and solvents were screened for the decoloring process, and the optimal amount of decolorizing agent and solvent were determined to be:hexane 200mL, activated charcoal 20g.Odor, color, physical and chemical indicators of rice germ oil had been reached the vegetable oil health standards (GB 2716-2005) after refining, AV decreased from 70.9mg/g to 0.69mg/g, POV reached 132.52mmol/kg, IV was 90.2g/100g, saponification value was 162mg/g, and content of unsaponifiable matter was 0.82%, refractive index was 1.4709.Fatty acid composition of rice germ oil before and after refining didn't change much, mostly was oleic acid, linoleic acid and palmitic acid, and content of unsaturated fatty acid was nearly 80%.