Abstract

Gln15-motilin was synthesized in a conventional manner by assembling seven peptide fragments followed by deprotection with 1M trifluoromethanesulfonic acid-thioanisole in trifluoroacetic acid. The usefulness of phenylthiotrimethylsilane for the reduction of Met(O) was confirmed. This motilin analog was as biologically active as synthetic motilin in terms of contraction of rabbit duodenal muscles, but in radioimmunoassay it was only about 25% as reactive with antiserum raised against synthetic porcine motilin.

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