Abstract
The protein of human milk at the various stages of lactation was separated into casein and serum protein and these were studied by electrophoresis.
Three fractions (α, β, γ-casein) in casein and five fractions in serum protein were observed.
Alfa-casein content was only about 2-3%, and the majority of the fractions consisted of β-casein and γ-casein which amounted to about 40 and 60%, respectively.
High concentration of globulin fraction was observed in only serum protein 0-10 days after parturition. The other samples showed only low concentrations.
