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Extraction of dioxins from cod liver oil by supercritical carbon dioxide

✍ Scribed by M. Jakobsson; B. Sivik; P.-A. Bergqvist; B. Strandberg; M. Hjelt; C. Rappe

Publisher: Elsevier Science
Year: 1991
Tongue: English
Weight: 493 KB
Volume: 4
Category: Article
ISSN: 0896-8446
DOI: 10.1016/0896-8446(91)90039-9

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✦ Synopsis

Dioxins and dibenzofurans are suspected to be quite toxic. They are fat soluble, and therefore, accumulate in fat-rich tissues (e.g., fish liver) and in products like milk. They have been detected in a large amount of food raw materials. Therefore it is urgent to find ways to purify such materials.

Supercritical carbon dioxide has been tested for its ability to extract these dioxins from cod liver oil containing different concentrations of free fatty acids. The efficiency depends on the applied pressure and on other conditions, such as free fatty acid content and entrainer added to the carbon dioxide.

The dioxins are best extracted with no ethanol added. In a semi-continuous mode, a reasonable separation of dioxins takes place at 150 bar and 40 "C, better than at higher pressures. About 25% of dioxins can be found in the first 10% of the oil extracted.

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