30 



VELOCITY OF REACTIONS 



Dried rennet is extremely slowly decomposed at 

 that temperature. At 158° C. the constant is K = 

 004 1. This circumstance recalls the "denaturation" 

 of egg-albumen at high temperatures, for which also 

 the presence of water is necessary. 



16 



14 



12 



o 

 o 



00 H 

 o 



08 



06 



40 



with Alkali Time 



-without Alkali 



80 



120 



160 min. 



Fig. 5. 



The enzymatic reaction which has been most 

 thoroughly investigated is that of invertase on cane- 

 sugar. The invertase was prepared from yeast-cells. 

 Victor Henri determined (1902) the velocity of in- 

 version of sugar with this enzyme and observed that 

 it behaves in a manner quite different from a mono- 

 molecular reaction. This experiment was controlled 



