Abstract
Supercritical fluid extraction (SFE) of polyunsaturated fatty acid (PUFA) ethyl esters coupled with pretreatment of Ag+ - π-complex formation was studied. PUFA esters such as eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) in fish oil were selectively dissolved into aqueous AgNO3 solution. After that semi batch SFE was carried out to recover PUFA esters from the pretreated aqueous solution using supercritical (SC) CO2, ethane and ethylene. All the PUFA esters could be recovered by SFE, and extracted products were consist of PUFA esters and Ag free water only. The results of SFE showed that the complex stability affected strongly on the SFE behavior. Selective separation for EPA-Et and DHA-Et was obtained when SC-CO2 and ethane were used, and 90 wt.% of DHA-Et could be produced at the final SFE stage. SC-ethylene has little selectivity for the PUFA esters, however, the extraction rates of PUFA esters were the fastest. This is because ethylene makes 7t-complex with Ag+ ion competitively.
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