Zobrazeno 1 - 10
of 45
pro vyhledávání: '"Gerard P. Rozing"'
Publikováno v:
Talanta. 187
High performance liquid chromatography (HPLC) with a solvent gradient and absorbance detection is one of the most widely used methods in analytical chemistry. The observed absorbance baseline is affected by the changes in the refractive index (RI) of
Autor:
Monika Dittmann, Konstantin Choikhet, Gert Desmet, Ken Broeckhoven, Matthias Verstraeten, Gerard P. Rozing, Jeroen Billen
Publikováno v:
Vrije Universiteit Brussel
A generic solution is proposed for the deleterious viscous heating effects in adiabatic or near-adiabatic systems that can be expected when trying to push the column operating pressures above the currently available range of ultra-high pressures (i.e
Autor:
Steffen Ehlert, Gerard P. Rozing, Jose-Angel Mora, Alexandra Höltzel, Monika Dittmann, Karsten Kraiczek, Ulrich Tallarek, Stephanie Jung
Publikováno v:
Analytical Chemistry. 81:10193-10200
This work investigates the impact of conduit geometry on the chromatographic performance of typical particulate microchip packings. For this purpose, high-performance liquid chromatography (HPLC)/UV-microchips with separation channels of quadratic, t
Autor:
Jose-Angel Mora, Steffen Ehlert, Monika Dittmann, Stephanie Jung, Ulrich Tallarek, Karsten Kraiczek, Gerard P. Rozing
Publikováno v:
Journal of Chromatography A. 1216:264-273
HPLC microchips are investigated experimentally with respect to packing density, pressure drop-flow rate relation, hydraulic permeability, and separation efficiency. The prototype microchips provide minimal dead volume, on-chip UV detection, and a 75
Autor:
Monika Dittmann, Gerard P. Rozing, Ulrich Tallarek, Karsten Kraiczek, Jose-Angel Mora, Steffen Ehlert
Publikováno v:
Analytical Chemistry. 80:5945-5950
We report an experimental study of separation efficiency in microchip high-performance liquid chromatography (HPLC). For this study, prototype HPLC microchips were developed that are characterized by minimal dead volume, a separation channel with tra
Autor:
Sebastiaan Eeltink, Emily F. Hilder, Frantisek Svec, Gerard P. Rozing, Laurent Geiser, Jean M. J. Fréchet, Wim Th. Kok, Peter J. Schoenmakers
Publikováno v:
Journal of Separation Science, 30(3), 407-413. Wiley-VCH Verlag
Preparation of monolithic capillary columns for separations in the CEC mode using UV-initiated polymerization of the plain monolith followed by functionalization of its pore surface by photografting has been studied. The first step enabled the prepar
Publikováno v:
Journal of Chromatography A, 1109(1), 74-79. Elsevier
Methacrylate-ester-based monoliths containing quaternary ammonium groups were prepared in situ in capillary columns and in simultaneous experiments in vials, employing thermal initiation. The chromatographic properties of the monoliths were determine
Publikováno v:
Journal of Separation Science, 27(17-18), 1431-1440. Wiley-VCH Verlag
A comparison is made between the efficiency of microparticulate capillary columns and silica and polymer-based monolithic capillary columns in the pressure-driven (high-performance liquid chromatography) and electro-driven (capillary electrochromatog
Autor:
Henk H. Lauer, Karsten Kraiczek, Tom van de Goor, Gerard P. Rozing, Kevin Killeen, Bernd Glatz, Hongfeng Yin
Publikováno v:
Journal of Separation Science. 27:1391-1401
A systematic investigation of the influence of the perimeter shape of open and particle packed fused silica capillaries on chromatographic properties such as resistance to flow and dispersion of solutes propelled through these channels has been condu
Autor:
Martin Vollmer, Bernd Glatz, Angelika Gratzfeld-Hüsgen, Edgar Nägele, Gerard P. Rozing, Ralf Moritz, Patric Hörth
Publikováno v:
Journal of Biochemical and Biophysical Methods. 60:233-263
Small-volume chromatographic columns are only able to generate narrow peaks when flow rates, injection volume and instrument components, such as detector, connecting tubing and fittings, are matched to the peak dispersion from the column. Criteria fo