I fables for the rough separate recognition of proteids and 



carbohydrates in solutions. 

 I. A solution of ppoteids and carbohydrates. 



l&anthoproteic 



(Acetic acid 



I and K 4 FeCy 6 



* Disappears on heating, returns on cooling. 

 II. Coag-ulable ppoteids. III. Non-eoag-ulable ppoteids. 



Excess H 2 ... 

 MgSO 4 to Sat n 



Ether (in neut- 

 ral reaction) 



Iodine 



Neutralisa- 

 tion 



Biuret 

 HNO a 



I V. Capbohydpates. 



N.B. To apply IV. in a mixture containing proteids acidulate with acetic 



acid, boil and filter. It is of no consequence if peptones remain in the 



solution. In performing the Biuret test employ one or two drops of CuS0 4 

 only to 3 cm of fluid. 



