[Examination of some peptide fractions left over after isolation of insulin from the pancreas. III. Analytical characterization of products by chromatography and electrophoresis].

The studies of separated and isolated components of Lipotropin-Polfa preparation by determining the contents of nitrogen and qualitative and quantitative composition of amino acids were performed. The component I which constituted 85% of the preparation weight, molecular weight ca. 3500, was separated by means of electrophoresis using polyacrylamide gel, into 3 fractions of polypeptides. The component I proved to have biological activity several times as large as the Lipotropin-Polfa preparation.