Table 1.

Characterization of caseins based on molecular mass, amino acid numbers, proline, and cysteine residues.

Milk Proteins (Caseins)	Molecular Mass	Amino Acids	Proline Residues	Cysteine Residues	PO4 Groups	Concentration (g/L)	Glycoproteins	References
αs1-casein	23,164	199	17	0	8	10	No	[2,17]
αs2-casein	25,388	207	10	2	10–13	2.6	No	[2,17]
β-casein	23,983	209	35	0	5	9.3	No	[2,17]
κ-casein	19,038	169	20	2	1	10.3	Yes	[2,17]