Phosphatides classification

Myelin is approximately 75% lipid and 25% protein. Carbohydrate residues are associated with both the lipid and the protein components of myelin. High proportions of cholesterol, phospholipid, and glycolipid are found in the lipid fractions. Phospholipids include ethanolamine phosphatides, phosphatidylserine, and phosphatidylinositol glycolipids include both neutral (cerebroside, sulfatide, galactosyldiglyceride) and polar (gangliosides, especially GMj and GMJ lipids. A classification and discussion of the metabolism of brain lipids is beyond the scope of this article readers are referred to Lajtha (1969), Davison (1968), Awasthi and Srivastava (1980), and Suzuki (1981). 

Still more grave objections could be made from the point of view of rigid classification, as in the last named three Chapters IX, X and XI, colloids have often been considered (phosphatides) which do not at all belong to macromolecular colloids, but to association colloids, the latter belonging to Part II of this Volume. 

Phospholipide (synonymous with phosphatide) is the term applied to a large group of complex or compound lipides which, upon complete hydrolysis, yields fatty acids, polyfunctional alcohols, nitrogenous bases, and phosphoric acid. The classification of the various phosphorus-containing lipides which, in the opinion of the authors, is most satisfactory is the one employed by Wittcoff. An abbreviated classification based upon the suggestions of Wittcoff follows ... 

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