Abstract
THE outstandingly high vitamin A content of the liver of the halibut (Hippoglossus hippoglossus) has led to considerable commercial interest in any species giving a liver oil of a potency comparable with halibut liver oil. In the same family as the halibut, several of the larger species give rich oils, but they are not of the same order of potency as good halibut oils. Samples of sturgeon (Acipenser species) liver oils examined varied widely in potency, as with halibut liver oil, and seemed quite comparable, the best sample showing 4,000 blue units in the antimony trichloride test for 0.2 c.c. of a 20 per cent solution. Recently, the liver oil of the tunny fish (Thunnus thynnus) has been examined. The oil was rich in vitamin A, the blue values for three samples being 1,927, 1,993 and 2,724. The livers contained about 20–25 per cent of oil. The particular fish used were caught off Scarborough.
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LOVERN, J. Fish Liver Oils Rich in Vitamin A. Nature 134, 422 (1934). https://doi.org/10.1038/134422b0
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DOI: https://doi.org/10.1038/134422b0
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