Removal of DDT and its Metabolites from Fish Oils by Molecular Distillation
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The distribution of DDT and its metabolities in cod liver oil and some other marine oils are reported. Cod liver oil showed an average content of (1.50 ± 0.31) mg DDT/kg. Dogfish liver oil contained 2.44 mg DDT/kg, and body oil from capelin, herring and mackerel, showed 0.40, 0.31 and 0.45 mg/kg, respectively. A whale oil showed a content of 1.33 mg DDT/kg. Stripping of a cod liver oil by molecular distillation is reported. When the removal of DDT is seen in relation to the losses of vitamin A, a run at a temperature of 170°C seemed to give optimum conditions. At this temperature 65% DDT was removed with a loss of about 25% vitamin A.