)F PROTEINS TO THE CONSTITUENTS OF URINE 



PROTEINS 



'OLYPEPTIDES 



MIDES 







II ♦ 



3,_C— NHo 



Benzene Compodnds, 

 e.g. Tryptophan 



H H 



I I II 

 — C— C— C— OH 



I I 

 H NH2 



NH 



(a) Digestion and 

 Tissue Enzymes 



(b) Bacteria 



CHa 



Homogentisic Acid 



OH 



Sulphur, Organic 

 Compounds, t.g. Cystin 



H 



I 

 O 



o=c 



H 



I 



o 



I 

 c=o 



H,N-C-H H-C-NH.3 



1 I 



H-C-S-S-C-H 



I 

 H H 



/ 



O 



II 

 .0_S— 0— K 



II 

 



NH 



CO2 



H,0 



K,SO, 



Ethereal Sulphates Inorganic Neutral 



Sulphates Sulphur, 

 e.g. Cystin 



