HIGHLY UNSATURATED FATTY ACID OR HIGHLY UNSATURATED FATTY ACID ETHYL ESTER WITH REDUCED ENVIRONMENTAL POLLUTANTS, AND METHOD FOR PRODUCING SAME

摘要

A highly unsaturated fatty acid or a highly unsaturated fatty acid ethyl ester produced using, as feedstock oil, an oil containing a highly unsaturated fatty acid as a constituent fatty acid. The highly unsaturated fatty acid or highly unsaturated fatty acid ethyl ester has a reduced content of environmental pollutants. The highly unsaturated fatty acid or highly unsaturated fatty acid ethyl ester contains, among the dioxins contained, polychlorinated dibenzo-p-dioxin (PCDD) and polychlorinated dibenzofuran (PCDF) in an amount of less than 0.05 pg-TEQ/g, and coplanar PCB (Co-PCB) in an amount of less than 0.03 pg-TEQ/g. A method for producing the highly unsaturated fatty acid or highly unsaturated fatty acid ethyl ester, wherein free fatty acids and environmental pollutants are removed from feedstock oil by thin-film distillation, and the oil obtained is made into an ethyl ester and refined by rectification and column chromatography.