High-performance liquid chromatography of casein hydrolysates phosphorylated and dephosphorylated. I. Peptide mapping

A mixture of small peptides of molecular weight averaging 1000 daltons, obtained by controlled hydrolysis of casein with proteases, chymotrypsin and trypsin, was separated by size-exclusion and reversed-phase high-performance liquid chromatography. Peptides were identified and located in the known casein structures from their amino acid content and their N- and C-terminal amino acid analyses. The primary structure of peptides identified from casein hydrolysate phosphorylated and casein hydrolysate dephosphorylated is presented.