title: Toroidal coil counter-current chromatography. Achievement of high resolution by optimizing flow-rate, rotation speed, sample volume and tube length.
abstract: This paper deals with optimization of a new seal-free compact toroidal coil centrifuge to achieve high resolution in analytical counter-current chromatography (CCC). Toroidal coil CCC (hydrostatic motion) has advantages compared with high-speed CCC (efficiently mixing solution with planetary motion) in the separation of protein or easily emulsified samples. A toroidal coil separation column of 0.4 mm I.D. PTFE tubing was accommodated around the periphery of the cylindrical centrifuge bowl. Using a two-phase solvent system composed of chloroform-acetic acid-0.1 M hydrochloric acid (2:2:1, v/v/v) and a set of dinitrophenyl-amino acids as test samples, a series of experiments was performed with parameters such as the column length, sample volume, flow-rate, elution mode of the mobile phase and rotation speed. The highest efficiency, over 10,000 theoretical plates, was achieved with a 100 m long coiled tube and an 11 ml total capacity at a flow-rate of 0.01 ml/min at 800 rpm.
authors.affiliation: Laboratory of Biophysical Chemistry, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD 20892, USA.
authors.forename: K
authors.initials: K
authors.lastname: Matsuda
authors.forename: S
authors.initials: S
authors.lastname: Matsuda
authors.forename: Y
authors.initials: Y
authors.lastname: Ito
mesh_terms: D000596:Amino Acids / Q000302:isolation & purification; D002498:Centrifugation / Q000379:methods*; D002845:Chromatography / Q000295:instrumentation / Q000379:methods*; D003312:Coriolis Force; D004140:Dinitrophenols / Q000302:isolation & purification; D011506:Proteins / Q000302:isolation & purification
chemical_list: D000596:Amino Acids; D004140:Dinitrophenols; D011506:Proteins