title: Continuous full filling capillary electrochromatography: chromatographic performance and reproducibility.
abstract: Continuous full filling capillary electrochromatography with nanoparticles as pseudostationary phase interfaced with electrospray ionisation mass spectrometric detection was used for reversed phase separations with very high separation efficiency. Several batches of nanoparticles were synthesised and their electrochromatographic performance were evaluated. Different parameters, such as repeatability, reproducibility, limit of detection, and peak asymmetry, were investigated yielding excellent results. The stability of the system over wide pH ranges and over time was found to be excellent. Very high separation efficiencies with over 1.1 million theoretical plates per metre were obtained. The limit of detection for the investigated dialkyl phthalates was approximately 1.0 micromol L(-1), corresponding to 3-5 fmol injected. After preparation, nanoparticle suspensions could be used without further treatment for at least an entire working day with maintained chromatographic qualities.
authors.affiliation: Analytical Chemistry, Centre for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden.
authors.forename: Peter
authors.initials: P
authors.lastname: Viberg
authors.forename: Peter
authors.initials: P
authors.lastname: Spégel
authors.forename: Jonas
authors.initials: J
authors.lastname: Carlstedt
authors.forename: Magnus
authors.initials: M
authors.lastname: Jörntén-Karlsson
authors.forename: Patrik
authors.initials: P
authors.lastname: Petersson
mesh_terms: D053801:Capillary Electrochromatography / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D053758:Nanoparticles; D010795:Phthalic Acids / Q000302:isolation & purification; D015203:Reproducibility of Results; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D010795:Phthalic Acids