Liver oils

Two molecules of vitamin A are formed from one molecule of -carotene. Vitamin A crystallizes in pale yellow needles m.p. 64 C. It is optically inactive. It is unstable in solution when heated in air, but comparatively stable without aeration. Vitamin A is manufactured by extraction from fish-liver oils and by synthesis from / -ionone. The role of vitamin A in vision seems to be different from its systemic function. See also relincne and rhodopsin. 

Pnstane is an alkane that is present to the extent of about 14% in shark liver oil Its lUPAC name is 2 6 10 14 tetramethylpentadecane Write its structural formula... 

Cod liver oil Linseed oil Menhaden oil Perilla oil Corn oil Cottonseed oil Olive oil Pine oil Red oil Soya bean oil Tung oil Whale oil Castor oil Lard oil... 

Gel permeation ehromatography (GPC)/normal-phase HPLC was used by Brown-Thomas et al. (35) to determine fat-soluble vitamins in standard referenee material (SRM) samples of a fortified eoeonut oil (SRM 1563) and a eod liver oil (SRM 1588). The on-line GPC/normal-phase proeedure eliminated the long and laborious extraetion proeedure of isolating vitamins from the oil matrix. In faet, the GPC step permits the elimination of the lipid materials prior to the HPLC analysis. The HPLC eolumns used for the vitamin determinations were a 10 p.m polystyrene/divinylbenzene gel eolumn and a semipreparative aminoeyano eolumn, with hexane, methylene ehloride and methyl tert-butyl ether being employed as solvent. 

Haifisch-ledcr, n. shark leather. -tran, m. shark-liver oil. 

Stock-fisch, m. stockfish (esp., dried codfish), -fischlebertran, m. cod-liver oil. -fleck, m. moldy stain, moldy spot, mildew, stockfleckig, a. spotted with mold, moldy ... 

Retinoids are alcohols and accordingly soluble in ethanol, isopropanol, and polyethylenglycol. Major sources of natural retinoids are animal fats, fish liver oil (retinylesters) and yellow and green vegetables (carotenoids). Ingested retinylesters (RE) are hydrolyzed to retinol by enteral hydrolases in the intestine. ROL and carotenoids are absorbed by intestinal mucosa cells. 

Small amounts of the precursor for l,25(OH)2-D3 synthesis are present in food (fish liver oil, egg yolk), but... 

Animal muscle (pork), carrot powder, total diet, wheat flour Skim milk powder (elements), whole meal flour, bovine muscle, wholemeal flour, brown bread, cod liver oil (PCBs), rye flom, haricots verts (beans), pork muscle, mixed vegetables, carrot, bran breakfast cereal, unspiked milk powder (PCDDs, PCDFs), spiked milk powder (PCDDs, PCDFs), milk powder Rye flour, milk powder, whey powder Pork meat... 

PCBs in cod, mussel and shrimp from Belgian continental shelf GC BCR CRM 349, PCBs in Cod liver oil Roose et al. 1998... 

Kannan, K., J. Falandysz, N. Yamashita, S. Tanabe, and R. Tatasukawa. 1992. Temporal trends of organochlorine concentrations in cod-liver oil from the southern Baltic proper, 1971-1989. Mar. Pollut. Bull. 24 358-363. Kawano, M., T. Inoue, T. Wada, H. Hidaka, and R. Tatasukawa. 1988. Bioconcentration and residue patterns of chlordane compounds in marine animals invertebrates, fish, mammals, and seabirds. Environ. Sci. Technol. 22 792-797. 

Toxaphene accumulates in tissues of many aquatic species, especially in lipid-rich tissues of polar fish and marine mammals (Swackhamer and McConnell 1993). Toxaphene concentrations in livers of Arctic fishes of 2.9 mg/kg FW and in Canadian cod liver oil of 28 mg/kg FW are recorded... 

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