| 摘要 |
Refining of fish waste product so that a concentrate of omega 3-fatty acid alkyl ester is formed with 20-30% eicosapentaenoic acid alkyl ester and 35-50% docosahexaenoic acid alkyl ester (both by weight) free from cholesterol. The omega 3-concentrate is produced through urea precipitation of the non- omega 3-fatty acid esters so that the filtrate from the precipitation may be extracted by means of hexane for the transmission of the omega 3-fatty acid esters and the cholesterol to the hexane extract. Hexane is thereafter removed. The remaining concentrate of the fatty acid esters with the cholesterol is cooled to a temperature of not lower than -50<o>C, whereby the cholesterol is crystallized. The remainder is a omega 3-concentrate with the composition mentioned above. |
