title: The impact of extra-column band broadening on the chromatographic efficiency of 5 cm long narrow-bore very efficient columns.
abstract: Small columns packed with core-shell and sub-2 μm totally porous particles and monolith columns are very popular to conduct fast and efficient chromatographic separations. In order to carry out fast separations, short (2-5 cm) and narrow-bore (2-2.1 mm) columns are used to decrease the analyte retention volume. Beside the column efficiency, another significant issue is the extra-column band-spreading. The extra-column dispersion of a given LC system can dramatically decrease the performance of a small very efficient column. The aim of this study was to compare the extra-column peak variance contribution of several commercially available LC systems. The efficiency loss of three different type 5 cm long narrow bore, very efficient columns (monolith, sub-2 μm fully porous and sub-2 μm core-shell packing) as a function of extra-column peak variance, and as a function of flow rate and also kinetic plots (analysis time versus apparent column efficiency) are presented.
authors: Budapest University of Technology and Economics, Department of Inorganic and Analytical Chemistry, Szt. Gellért tér 4, 1111 Budapest, Hungary. fekete.szabolcs1@chello.hu
authors: Szabolcs
authors: S
authors: Fekete
authors: Jeno
authors: J
authors: Fekete
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation*; D016062:Porosity