Studies on secretin. II. Synthesis of secretin with high activity.

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Abstract
Highly active synthetic secretin was obtained after deprotection of completely protected secretin with HF/anisole followed by a simple 2-step purification, involving ion-exchange chromatography and preparative reverse-phase high performance liquid chromatography (HPLC). The homogeneity of synthetic secretin was assessed by TLC, HPLC, disc electrophoresis and other physicochemical methods. The synthetic secretin was found on HPLC to contain none of the diastereoisomers which might be produced during fragment condensation. Its biological activity was 5750 c.u.[clinical unit]/mg in stimulating exocrine pancreatic juice in the anesthetized rat, and this is the highest value among those of various natural and synthetic secretins (4000 CU/mg). Secretin was unexpectedly stable throughout the purification procedures. The synthetic method is suitable for the large-scale production of secretin for clinical use.

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