Absorption of fat-soluble vitamins and sterols

Absorption of fat-soluble vitamins and sterols

The molecular structure of the four fat-soluble vitamins and of cholesterol, the major intestinal sterol in man, are shown in Figure 1. In spite of the obvious dissimilarities that exist between these compounds they possess one common feature, namely, they are all nonpolar lipids with extremely low solubilities in aqueous media. Because of this, it is convenient to consider them together when e...

Fat-soluble vitamins.

Absorption of water-soluble vitamins.

The water-soluble vitamins vary widely in chemical structure and properties, so it is not surprising that the characteristics of absorption of individual members of the group also show differences. Water-soluble vitamins are absorbed mainly into the blood, some very freely (e.g. ascorbic acid), others (e.g. thiamine) only in limited amounts. Vitamin Biz has an apparently unique mode of absorpti...

The fat-soluble vitamins in poultry nutrition.

30. James, E. M., Norris, F. W. & Wokes, F. (1947). Analyst, 72, 327. 31. Jones, C. R. & M o m , T. (1946). Cereal Chem. m, @. 32. Jukes, T. H. (2941). J. Nutn’t. 21, 193. 33. Kemmerer, A. R. & Fraps, G. S. (1945). Bull. Tex. ag& Exp. Stu. no. 671. 34. Krehl, W. A., Huerga, J. de la, Elvehjem, C. A. & Hart, E. B. (1946). J . biol. C h . 166, 53. 35. Lillie, R. J. & Briggs, G. M. (1947). Poult. ...

Fat-soluble vitamins in cystic fibrosis.

When cystic fibrosis (CF) was first recognized (Andersen, 1939), symptoms and signs of deficiency of vitamin A were common in infants with the condition. It was realized that pancreatic insufficiency from birth caused fat malabsorption and, therefore, malabsorption of the fat-soluble vitamins A, D, E and K. With the use of pancreatic enzyme replacement therapy and routine vitamin supplementatio...