20 



CONSTITUENTS OF MILK 



The following results of Van Slyke and Bosworth ^^ show the 

 composition of milk serum as separated by filtration through 

 porcelain candles. 



Table VI 

 COMPOSITION OF MILK AND MILK SERUM 



Percentage of 



Milk Constituenta 

 in Serum. 



100.0 



NU 



37.1 

 100.0 

 100.0 



53.6* 



64.4 



33.3 



53.8 

 100.0 

 100.0 

 100.0 



55.2 



Caseinogen 



Albumin 



Nitrogen ia other compounds 



Citric acid 



Phosphorus (organic and inorganic) 



Phosphorus (organic) 



Calcium 



Magnesium 



Potassium 



Sodium 



Chlorine 



Ash 



Not obtained on same sample. 



Van Slyke and Bosworth suggest that the various combina- 

 tions of acids and bases in milk are: 



Proteins combined with calcium 3 . 20 



Di-calcium phosphate (CaHP04) 0. 175 



Calcium chloride 0. 119 



Mono-magnesium phosphate (MgH4P208) 0. 103 



Sodiiun citrate (NasCeHsO?) 0.222 



Potassium citrate (KsCeHsO?) 0.052 



Di-potassium phosphate (K2HPO4) 0.230 



Other constituents which have been found in minute traces 

 are fluorine, iodine, silica, acetates, and thiocyanates. 



Lecithin. C44H90O9NP also exists in milk in minute quan- 

 tities. 



