Study on the composition of casein from individual human milks.

The study of the chemical composition and of the electrophoretograms of 21 different human whole casein samples confirms the presence of an important heterogeneity between the different samples. A very considerable variability of phosphorus and sugars contents and a correlation between the different sugars components of the casein have been demonstrated statistically. The study of 3 milk samples from the same woman showed a decrease of the amino-sugars of the casein after the birth.