Abstract
Of the N-containing phospholipins (Levene and Rolf, 1921; McLean and McLean, 1927; Thierfelder and Klenk, 1930; Magistris, 1931, Robison, 1932; Klenk, 1933) at present three groups have been fairly accurately defined and isolated in an almost pure state:— O= Ρ—O. diglyceride O= Ρ—O. diglyceride O= Ρ—O. (fatty acid) sphingosine O= Ρ —O. choline O= Ρ—O. colamine O=Ρ —O. choline O= Ρ —OH O= Ρ—OH O= Ρ—OH I II III Lecithin Cephalin Sphingomyelin These compounds are diesters of phosphoric acid. One acid group is esterified with an alcoholic base which may be either colamine (aminoethylalcohol NH
2
. CH
2
. CH
2
. OH) or the corresponding quaternary ammonium base choline (OHN(CH
2
)
3
. CH
2
. CH
2
. OH). The second acid group is linked in the sphingomyelin with sphingosine, the amino group of which is substituted by a fatty acid radical, or in lecithin and cephalin with a diglyceride. The analogous compounds lysolecithin and lysocephalin contain a monoglyceride instead of a diglyceride.
Reference49 articles.
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2. Bronsted I. N. (1923). ` Rec. Trav. chim. Pays-Bas ' vol. 42 p. 718.
3. Bronsted I. N.
(1926). ` J. phys. Chem. ' vol. 30 p. 777.
4. Acid and Basic Catalysis.
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