Synthesis of Des-Pro2-Bradykinin and Its Behavior in Chromatography

Des-Pro2-Bradykinin was synthesized by the classical solution method as a reference compound for a possible contaminant in synthetic bradykinins, and its behavior in various chromatographic analyses was examined. It showed almost the same Rf values as bradykinin under several different conditions in cellulose thin layer chromatography and in paper electrophoresis, but was clearly separable from bradykinin by reversed phase high performance liquid chromatography under specific conditions. Since des-Pro2-bradykinin was found to have a potent bradykinin-potentiating activity, contamination by this material should be carefully avoided in bradykinin synthesis.