CHAPTER XII. 



CASEIN COMPOUNDS. 



IN view of the extensive general application of casein it is 

 not surprising that many attempts have been made to obtain 

 compounds of this substance with chemical elements, for a 

 variety of purposes. In addition to those already described 

 are a number of others, which, together with their mode of 

 preparation, are given below. 



To prepare compounds of casein with iodine the two sub- 

 stances are intimately mixed and warmed. The resulting 

 products are used in medicine (German patent 79,926). 



Dr. Bernstein prepares albumose and peptone from milk 

 casein by bacterial agency. 



Solid compounds, soluble in water, are obtained from 

 casein with hydrobromic and hydriodic acids of medium 

 strength by stirring the substances together ; or by dissolving 

 the casein in the dilute or concentrated acid (German patent 

 124,232, 1900), and precipitating the resulting casein com- 

 pound. In therapeutic value these compounds come between 

 the metallic bromides or iodides and the corresponding free 

 acids. 



According to J. Just's American patent of 4th February, 

 1902, a casein phosphate can be prepared by adding to an 

 aqueous solution of phosphoric acid a portion of the necessary 

 quantity of casein, heating the mixture and concentrating it 

 to syrup. The remainder of the casein is then added and 



well mixed with the mass, which is finally dried. 



(167) 



