Search Results - "Pyell, Ute"

Photothermal trace detection in capillary electrophoresis for biomedical diagnostics and toxic materials (invited)

Authors: Faubel, Werner Heissier, Stefan Pyell, Ute

Source: Review of Scientific Instruments; Jan2003, Vol. 74 Issue 1, p491-494, 4p

Chemistry of polynuclear metal complexes with bridging carbene or carbyne ligands. Tetranuclear metal compounds with rhenium-molybdenum or -tungsten bonds. Crystal structures of {Mo2Re2(μ3-CC6H4Me-4)2(μ-CO)2(CO)7(η-C5H5)2}·1.5CH2Cl2 an

Authors: Jeffery, John C. Parrott, Michael J. Pyell, Ute

Source: Journal of the Chemical Society, Dalton Transactions; May 1988, Issue 5, p1121-1129, 9p

Calibration-free concentration determination of charged colloidal nanoparticles and determination of effective charges by capillary isotachophoresis.

Authors: Pyell, Ute Bücking, Wendelin Huhn, Carolin et al.

Source: Analytical & Bioanalytical Chemistry. Nov2009, Vol. 395 Issue 6, p1681-1691. 11p. 2 Charts, 10 Graphs.

Capillary electromigration separation techniques – current trends.

Authors: Pyell, Ute¹ pyell@chemie.uni-marburg.de

Source: Analytical & Bioanalytical Chemistry. Jan2003, Vol. 375 Issue 1, p20-22. 3p.

Mixed-mode acrylamide-based continuous beds bearing tert-butyl groups for capillary electrochromatography synthesized via complexation of N-tert-butylacrylamide with a water-soluble cyclodextrin. Part I: Retention properties.

Authors: Al-Massaedh, “Ayat Allah” Pyell, Ute

Source: Journal of Chromatography A. Dec2016, Vol. 1477, p114-126. 13p.

Subjects: Acrylamide, Butyl group, Capillary electrochromatography, Complexation reactions, Cyclodextrins, Hydrophilic interaction liquid chromatography

In-capillary derivatization with o-phthalaldehyde in the presence of 3-mercaptopropionic acid for the simultaneous determination of monosodium glutamate, benzoic acid, and sorbic acid in food samples via capillary electrophoresis with ultraviolet detection

Authors: Aung, Hnin-Pwint Pyell, Ute

Source: Journal of Chromatography A. Jun2016, Vol. 1449, p156-165. 10p.

Subjects: Derivatization, Monosodium glutamate, Benzoic acid, Sorbic acid, Capillary electrophoresis, Canned foods, Electrolyte solutions, Separation (Technology)

Characterization of hydrophilic coated gold nanoparticles via capillary electrophoresis and Taylor dispersion analysis. Part II: Determination of the hydrodynamic radius distribution – Comparison with asymmetric flow field-flow fractionation.

Authors: Pyell, Ute Jalil, Alaa H. Urban, Dominic A. et al.

Source: Journal of Colloid & Interface Science. Nov2015, Vol. 457, p131-140. 10p.

Subjects: Gold nanoparticles, Capillary electrophoresis, Dispersion (Chemistry), Hydrodynamics, Surface active agents

Characterization of gold nanoparticles with different hydrophilic coatings via capillary electrophoresis and Taylor dispersion analysis. Part I: Determination of the zeta potential employing a modified analytic approximation.

Authors: Pyell, Ute Jalil, Alaa H. Pfeiffer, Christian et al.

Source: Journal of Colloid & Interface Science. Jul2015, Vol. 450, p288-300. 13p.

Subjects: Gold nanoparticles, Hydrophilic compounds, Capillary electrophoresis, Particle size determination, Zeta potential, Borax

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Determination and regulation of the migration window in electrokinetic chromatography

Authors: Pyell, Ute¹ pyell@chemie.uni-marburg.de

Source: Journal of Chromatography A. May2004, Vol. 1037 Issue 1/2, p479-490. 12p.

Subjects: Chromatographic analysis, Gel electrophoresis, Phase partition, Colloids

Diffusion as major source of band broadening in field-amplified sample stacking under negligible electroosmotic flow velocity conditions

Authors: Huhn, Carolin Pyell, Ute

Source: Journal of Chromatography A. Jun2010, Vol. 1217 Issue 26, p4476-4486. 11p.

Subjects: Electro-osmosis, Diffusion, Hydrodynamics, Dispersion (Chemistry), Electrolytes, Benzoates, Aniline, Electric conductivity

Separation of very hydrophobic analytes by micellar electrokinetic chromatography: IV. Modeling of the effective electrophoretic mobility from carbon number equivalents and octanol–water partition coefficients

Authors: Huhn, Carolin Pyell, Ute

Source: Journal of Chromatography A. Jul2008, Vol. 1198-1199, p208-214. 7p.

Subjects: Hydrophobic surfaces, Electrophoretic deposition, Chromatographic analysis, Analytical chemistry

Investigation of the ion-exchange properties of methacrylate-based mixed-mode monolithic stationary phases employed as stationary phases in capillary electrochromatography

Authors: Al-Rimawi, Fuad Pyell, Ute

Source: Journal of Chromatography A. Aug2007, Vol. 1160 Issue 1/2, p326-335. 10p.

Subjects: Methyl methacrylate, Sulfonic acids, Electrophoresis, Ion exchange (Chemistry)

Adamantyl-group containing mixed-mode acrylamide-based continuous beds for capillary electrochromatography. Part IV: Investigation of the chromatographic efficiency dependent on the retention mode.

Authors: Al-Massaedh, “Ayat Allah” Pyell, Ute

Source: Journal of Chromatography A. Jul2014, Vol. 1349, p80-89. 10p.

Subjects: Adamantane, Acrylamide, Capillary electrochromatography, Chromatographic analysis, Separation (Technology), Hydrophilic interaction liquid chromatography, Ion exchange (Chemistry)

Adamantyl-group containing mixed-mode acrylamide-based continuous beds for capillary electrochromatography. Part II. Characterization of the synthesized monoliths by inverse size exclusion chromatography and scanning electron microscopy.

Authors: “Ayat Allah” Al-Massaedh Pyell, Ute

Source: Journal of Chromatography A. Jan2014, Vol. 1325, p247-255. 9p.

Subjects: Adamantane, Capillary electrochromatography, Acrylamide synthesis, Gel permeation chromatography, Scanning electron microscopy, Pore size distribution

Adamantyl-group containing mixed-mode acrylamide-based continuous beds for capillary electrochromatography. Part III. Optimization of the chromatographic efficiency.

Authors: Al-Massaedh, “Ayat Allah” Pyell, Ute

Source: Journal of Chromatography A. Jan2014, Vol. 1325, p186-194. 9p.

Subjects: Adamantane, Acrylamide, Continuous beams (Structural engineering), Capillary electrochromatography, High performance liquid chromatography, Polymerization

Imidazolium-based ionic liquid-type surfactant as pseudostationary phase in micellar electrokinetic chromatography of highly hydrophilic urinary nucleosides.

Authors: Rageh, Azza H. Pyell, Ute

Source: Journal of Chromatography A. Nov2013, Vol. 1316, p135-146. 12p.

Subjects: Imidazoles, Ionic liquids, Cationic surfactants, Stationary phase (Chromatography), Micellar electrokinetic chromatography, Nucleosides, Urinalysis

Sweeping as a multistep enrichment process in micellar electrokinetic chromatography: The retention factor gradient effect.

Authors: El-Awady, Mohamed Pyell, Ute

Source: Journal of Chromatography A. Jul2013, Vol. 1297, p213-225. 13p.

Subjects: Micellar electrokinetic chromatography, RF values (Chromatography), Sweeping & dusting, Solubility, Gas chromatography

Adamantyl-group containing mixed-mode acrylamide-based continuous beds for capillary electrochromatography. Part I: Study of a synthesis procedure including solubilization of N-adamantyl-acrylamide via complex formation with a water-soluble cyclodextrin

Authors: Al-Massaedh, Ayat Allah Pyell, Ute

Source: Journal of Chromatography A. Apr2013, Vol. 1286, p183-191. 9p.

Subjects: Capillary electrochromatography, Solubilization, Acrylamide, Complex compounds synthesis, Mixtures, Cyclodextrins

Determination of urinary nucleosides via borate complexation capillary electrophoresis combined with dynamic pH junction-sweeping-large volume sample stacking as three sequential steps for their on-line enrichment.

Authors: Rageh, Azza Kaltz, Achim Pyell, Ute

Source: Analytical & Bioanalytical Chemistry. Sep2014, Vol. 406 Issue 24, p5877-5895. 19p.