LACTALBUMIN 

 Table IV 



17 



The time required for the coagulation of milk by rennin, 

 other conditions being equal, is inversely proportional to the 

 concentration of the enzyme. Acids and salts of the alkaline 

 earths accelerate the reaction, while alkalies, albumoses, and 

 large amounts of neutral salts, retard it: the fat content also 

 influences the velocity of the reaction. The reaction can be 

 inhibited by the addition of normal horse serum and a similar 

 effect is produced by the anti-rennin prepared by Morgenrath ^^ 

 by repeated injection of rennin into the blood stream of rabbits. 

 As the inhibitory action of horse serum can be prevented by 

 neutralisation with acid (Raudnitz and Jakoby) it seems prob- 

 able that both horse serum and anti-serum act by fixation of 

 the calcium ions. 



Lactalbumin. This constituent of milk has, according to 

 Sebehen, the following composition: 



These results show that the essential difference in compo- 

 sition between the albumin of milk and the phospho proteid 

 (caseinogen) lies in the absence of phosphorus in the former and 

 its markedly higher content of sulphur. 



Lactalbumin follows the general reactions of other albumins 

 in being soluble in neutral saturated solutions of magnesium 



