一种DHA营养食品添加剂的制备方法

The present invention of DHA nutrient food additive includes the following steps: firstly, making fish oil undergo the process of modification treatment, i.e. making the refined fish oil undergo the process of esterification reaction to obtain the fish tallow acid ethyl ester; then using fish oil ethyl ester as raw material, and utilizing combination of silver nitrate complexation reaction and CO2 supercritical rectification to extract DHA; finally adopting high-molecular cyclodextrin beta, alpha and gamma to make physical embedment so as to obtain the invented DHA nutrient food additive. The additive contains DHA with high purity, can be resist oxidation, and can be added in various foods.