ENZYMES OR FERMENTS 



71 



of the pancreas. Erepsin occurs in the succus entericus, in the 

 intestinal mucous membrane, and in the tissues generally. The 

 main action of these enzymes (explained more fully later) may be 

 .synopsized thus: 



Pepsin 



Trypsin 



Protein 



i 



Proteoses 



i 



Peptones 



I 

 Polypeptides 



I 

 Amino acids 



Erepsin 







Erepsin (?) 



Lipolytic (Fat-splitting) lipase or steapsin occur particularly in 

 the gastric juice, pancreatic juice, and the blood: 



Neutral fat 



V. 

 Fatty acid 



Glycerine 



Amylolytic (Starch-splitting) sometimes known as the diastases. 

 'The chief are the ptyalin of the saliva, which acts on boiled or soluble 

 .starch, and amylopsiii of the pancreatic juice, which can act on un- 

 boiled starch. 



Amylopsin 



Starch 



Ptyalin \j/ 



Soluble starch 



Erythrodextrin 



Achroodextrin 



Maltose 



The glycogenase of the liver may perhaps be included in this 

 ;group; it converts glycogen through similar stages to maltose. 



Sucrolytic (Sugar-splitting). These enzymes split the disaccharide 

 sugar into monosaccharides. They occur chiefly in the succus enteri- 

 cus; their action may be expressed graphically as follows: 



Maltase 

 Maltose 



Dextrose Dextrose 



Lactase 

 Lactose 



Invertase 



Dextrose Galactose 



Dextrose Levulose 



