Untersuchungen über die Lipoide der Säugetierleber. III. Mitteilung. Über ein Polydiaminophosphatid der Schweineleber.

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Abstract
III. A polydiaminophosphatide of pig''s liver. It has been previously shown that sphingomyelin of the brain contains a mixture of several fatty acids. The authors obtained a phosphatide from pig''s liver with the proper 2:1 ratio of N:P. This compound decomposed above 80[degree] C. Crystals of long needles were obtained from methyl alcohol. By means of fractional crystallization of the Li salt, it was established that 3 fatty acids in equimolecular ratio were present:[long dash] Stearic, palmitic and lignoceric. The tentative structural formula for this phosphatide is given, and the technical procedures and apparatus described.[long dash]IV. Concerning a half technical extraction apparatus for biochemical purposes. An apparatus is described for extraction of large quantities of desiccated organs. It is so designed that extractions can proceed with the exclusion of light and air and long periods of extraction with combustible materials can be safely carried out.[long dash]V. Concerning the nature of the so-called unsaponifiable lipids of the vertebrate liver. The unsaponifiable fraction of pig''s liver was esterified with the dianhydride of butane-tetra-carbonic acid and a water soluble Na salt obtained. By treatment of the ester with 80% alcohol, in which it is insoluble, an oil was obtained which was neutral, N-containing and fully saturated. Analysis revealed it to be related to sphingosin but with a melting point 15[degree] higher.

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