[Study of various peptides isolated from residues after extraction of insulin from the pancreas. I. Chemical characteristics of the studied substances].

Several series of Lipotropin substance produced at "Polfa" were subjected to physiochemical investigations. The contents of dry residue, ash, ribose, protein, total nitrogen, ammonium nitrogen and amino acid nitrogen were determined. Particular series proved to differ in contents of ribose and amino acids. For the purpose of comparison, identical studies were carried out with Lipormone made by "Labor. Choay" (France). Substantial differences were found between the two preparations.