Studies on peptides. CXIII. Synthesis of the heptacosapeptide amide corresponding to the entire amino acid sequence of chicken secretin.

The heptacosapeptide amide corresponding to the entire amino acid sequence of chicken secretin was synthesized by assembling four peptide fragments followed by deprotection with thioanisole-mediated trifluoromethanesulfonic acid in TFA. The deprotected peptide was purified by gel-filtration on Sephadex G-25, followed by ion-exchange chromatographies on CM-cellulose and DEAE-Sepharose. Synthetic peptide stimulated the flow of pancreatic alkaline juice and decreased systemic blood pressure in rats.