106 



THE PROTEIN SUBSTANCES. 



obtained on cleavage, but we must bear in mind that the figures, because 

 of the difficulty in the quantitative estimation, are not quite exact, but 

 must be considered as minimum values. As a representative of the glob- 

 ulin group we give fibrin, which is a coagulated globulin; and as repre- 

 sentative of the phosphoprotein group, besides casein also ovovitellin, 

 although not quite pure. The results are based on 100 parts of the 

 substances. 



The proteins occurring in the plant kingdom either in the seeds or 

 tuberes belong chiefly to the globulins, which correspond essentially in 

 properties to the animal globulins. Besides these many other less 

 abundant proteins occur, which like the albumins are soluble in water, 

 while toward certain salts they behave like globulins. It is not clear 

 whether the phosphorized plant proteids contain their phosphorus as 

 impurities or whether they are the same as the animal phosphoproteins. 

 In seeds there occur also proteins, which are not represented in the animal 

 kingdom and of these we must especially mention the prolamines. They 

 are soluble in alcohol and besides this they are characterized by not 

 yielding any lysine on hydrolysis. 



1 Abderhalden and H. Pribram, Zeitschr. f. physiol. Chem., 21. 



2 Abderhalden, Lehrb. d. physiol. Chem., 1909. 

 8 K. Morner, Zeitschr. f. physiol. Chem., 34. 



4 Osborne and co-workers, Amer. Journ. of Physiol, 24. 



6 Abderhalden and Voitinovici, Zeitschr. f. physiol. Chem., 52. 



8 Kutscher, Endprodukte der Trypsin Verdauung, Habit. Schrift., Marburg, 1899. 



7 Osborne and Guest, Journ. of biol. Chem., 9. 



8 Abderhalden and Hunter, Zeitschr. f. physiol. Chem., 48. 



9 Osborne and D. B. Jones, Amer. Journ. of Physiol., 24. 



10 Levene and D. v. Slyke, Journ. of biol. Chem., 6. 



11 Colorimetric determinations by Fasal, Bioch., Zeitschr, 44. 



