CUORIN. 241 



sequent chapter (XIII). The only carefully studied monamidodiphos- 

 phatide is cuorin, discovered by ERLANDSEN. 



Cuorin, C7iH 12 5NP 2 O 2 i, is a monamidodiphosphatide prepared by 

 ERLANDSEN l from the heart muscle of the ox, and which has an iodine 

 equivalent of 101. It yields as cleavage products 3 molecules fatty acids 

 of unknown nature but partly or entirely belonging to the series C n H 2n - 4 O2 

 and C n H 2n _ 6 O 2 ; also glycerin, phosphoric acid and a base which is 

 not well known, but is not choline. Cuorin is autooxidizable, and gives 

 PETTENKOFER'S bile acid test. 



Cuorin is amorphous, yellowish-brown and similar to rosin. It 

 gives a neutral solution with water which is like an emulsion. Cuorin 

 does not reduce FEHLING'S solution, even after boiling with acids. It is 

 soluble in ether, chloroform, petroleum ether and carbon disulphide. 

 It dissolves with difficulty in benzene ; it is insoluble in ethyl and methyl 

 alcohol and in acetone. Cuorin is precipitated from its alcohol-ether 

 solution by cadmium or platinum chloride. 



1 Zeitschr. f. physiol. Chem., 51, where the method of preparation is described. 



