Purification of Solid-Phase Synthesized Peptides on the Coil Planet Centrifuge

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Abstract
The analytical flow-through coil planet centrifuge, an instrument for countercurrent chromatography, performs the preparative purification of synthetic peptides. Various 2-phase solvent systems were tried with either phase mobile to purify many synthesized peptides. A series of N-terminal fragment peptides of cholecystokinin octapeptide (CCK 26-33) were synthesized by solid-phase techniques and purified on the coil planet centrifuge. The peptides were sulfated and chromatographed again. For hydrophobic peptides, purification is effected in solvent systems with a mobile aqueous phase. The n-butanol, acetic acid and water system (4:1:5 by volume) with the lower phase mobile was utilized. For sulfated peptides, the neutral system, 0.2 M ammonium acetate and n-butanol was generally applied.
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