title: Influence of pressure upon coupling pressurized capillary electrochromatography with nuclear magnetic resonance spectroscopy.
abstract: In this work, the influence of supplementary pressure on the separation efficiency of pressurized capillary electrochromatography (pCEC) was examined. At low pressures of up to 30 bar, which is more than sufficient to prevent bubble formation, no significant loss in separation efficiency is observed. Even at 100 bar, the efficiency of pCEC is still significantly better than without application of an electric field. In addition, analysis times are drastically reduced compared to both capillary electrochromatography (CEC) and capillary HPLC. On the basis of these results, an improved interface for capillary NMR coupling is described and used for the separation and identification of a mixture of unsaturated fatty acid methyl esters. Under these conditions, the analysis time could be shortened by up to a factor of 10 when pCEC is coupled to NMR spectroscopy.
authors.affiliation: Institut für Organische Chemie, Universität Tübingen, Germany.
authors.forename: P
authors.initials: P
authors.lastname: Gfrörer
authors.forename: L H
authors.initials: LH
authors.lastname: Tseng
authors.forename: E
authors.initials: E
authors.lastname: Rapp
authors.forename: K
authors.initials: K
authors.lastname: Albert
authors.forename: E
authors.initials: E
authors.lastname: Bayer
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D020374:Chromatography, Micellar Electrokinetic Capillary / Q000379:methods; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008832:Microchemistry / Q000379:methods; D011312:Pressure