title: Preparative countercurrent chromatography with a slowly rotating helical tube.
abstract: The capability of a simple countercurrent chromatographic scheme for obtaining high-resolution preparative-scale separations was demonstrated with the separations of a series of dinitrophenyl (DNP) amino acids and peptides. Basic studies on stationary phase retention and partition efficiency with a low-viscosity chloroform-acetic acid-0.1 N hydrochloric acid (2:2:1) phase system together with the results previously obtained with a vascous n-butanol system suggest a general applicability of low-interfacial tension phase systems by the present method.
mesh_terms: D000596:Amino Acids / Q000302:isolation & purification*; D002845:Chromatography / Q000295:instrumentation*; D003377:Countercurrent Distribution / Q000295:instrumentation*; D004140:Dinitrophenols; D008722:Methods; D010455:Peptides / Q000302:isolation & purification*
chemical_list: D000596:Amino Acids; D004140:Dinitrophenols; D010455:Peptides