PROTEOLYTIC ENZYMES 



With Pepsin in acid solutions. 

 Protein. 



Acid-albumin. 



Meta-protein. 



Primary proteoses. Prot-albumose. Hetero-albumose. 



Secondary proteoses. Deutero-albumose. Deutero-albumose. 



Peptones. Peptones. 



The primary proteoses derived from the acid albumin 

 can be salted out by saturating the solution with sodium 

 chloride or half saturation with ammonium sulphate. 

 Of these two types exist, namely, proto- and hetero- 

 compounds ; the former are very soluble in pure salt-free 

 water, while the latter are only very slightly soluble in 

 water and begin to coagulate and separate from the proto- 

 albumoses when the mixture is dialysed to get rid of the 

 salt. The hetero-albumoses are precipitated from salt 

 solutions by dilution with water. 



The secondary proteoses, representing products of 

 further hydrolysis, may be precipitated by complete 

 saturation of their solutions with ammonium sulphate. 



From the proteoses peptones are ultimately formed. 

 These are bodies of simpler constitution which cannot be 



