How to refine fish oil by molecular distillation?
Fish oil is rich in all-cis high-unsaturated fatty acids eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). This ingredient has good physiological activity, not only has the functions of lowering blood fat, lowering blood pressure, inhibiting platelet aggregation, lowering blood viscosity, but also anti-inflammatory, anti-cancer, and improving immunity, etc. It is considered to be a potential natural and functional food.
EPA and DHA are mainly extracted from marine fish oil. How to refine fish oil?
The traditional separation method is the urea inclusion precipitation method and the freezing method. The urea inclusion precipitation method can effectively remove the saturated and low-unsaturated fatty acid components in the product and increase the content of DHA and EPA in the product, but it is difficult to separate other high-unsaturated fatty acids from DHA and EPA.
Moreover, the fish oil produced by this method, has heavy color, large astringency and high peroxide value. It needs to be further decolorized & deodorized before it can be made into a food grade product, the recovery rate is only 16%.
Compared with this method, molecular distillation process has an absolute advantage, it is an effective & high throughout method for separating EPA and DHA.
Since the average free path of the impurity fatty acids in the material is similar to that of EPA and DHA ethyl ester, through the molecular distillation method the recovery rate can reach 70%, and the fish oil has good color and pure smell,low peroxide value, and the mixture can be divided into products with different ratios of DHA and EPA.