Explanipedia

Evanescent-Wave Spectroscopy on Bulk-Response Optode Membranes Open

R. E. Dohner, Ursula E. Spichiger, W. Simon · 1992

The absorbance of a solvent polymerie bulk optode membrane in contact with sapphire as a wave-guide is studied with the attenuated total reflection (ATR) technique. Utilizing thin (≤ 1 μm) and, therefore, fast-responding membranes, high va…

Potentiometric Detector for Capillary Zone Electrophoresis Open

Carsten Haber, Ivo Silvestri, Stephan Röösli, W. Simon · 1991

The use of a potentiometric microelectrode as an end-column detector in capillary zone electrophoresis (CZE) is described. Uncoated fused silica capillaries with an internal diameter (I. D.) of 25 μm are used. The microelectrode is placed …

Potentiometric Detector for Capillary Zone Electrophoresis Open

Carsten Haber, Ivo Silvestri, Stephan Röösli, W. Simon · 1991

The use of a potentiometric microelectrode as an end-column detector in capillary zone electrophoresis (CZE) is described. Uncoated fused silica capillaries with an internal diameter (I. D.) of 25 ?m are used. The microelectrode is placed …

ION-SELECTIVE SENSORS FOR CLINICAL ANALYSIS Open

W. Simon, Ursula E. Spichiger‐Keller · 1991

New Solid-State Contact for lon-Selective Liquid Membrane Electrodes Open

Lucas F. J. Dürselen, U. Oesterlé, Susanna Schuppisser, Pham Hung Viet, Yuji Miyahara , et al. · 1990

A new kind of solid-state contact for ion-selective electrodes based on solvent polymeric membranes is described. These electrodes show similar electrochemical behaviour to conventional ion-selective membranes in contact with an internal f…

Neutral ionophore-based selective electrode for assaying the activity of magnesium in undiluted blood serum Open

Marizel Rouilly, Bruno Rusterholz, Ursula E. Spichiger, W. Simon · 1990

The concentration of free, ionized magnesium in undiluted blood serum can be determined potentiometrically with a new magnesium-selective carrier in polymeric membrane electrodes (by weight 66% plasticizer, approximately 33% polyvinyl chlo…

Very Lipophilic Ca2⊕-Selective Ionophore for Chemical Sensors of High Lifetime Open

Peter Gehrig, Bruno Rusterholz, W. Simon · 1989

Ionophores based on 3-oxapentane-1,5-diamide derivatives with water/1-n-octanol partition coefficients up to 1022 were synthesized. They have sufficient lipophilicity to be used in solvent polymeric membranes for optodes, ISFET’s, and ion-…

Anion-Selective Optical Sensors Based on a Coextraction of Anion-Proton Pairs into a Solvent-Polymeric Membrane Open

Susie S. S. Tan, Peter C. Hauser, Nikos A. Chaniotakis, Gabriela Suter, W. Simon · 1989

The design of optical sensing devices for anions based on the coextraction of anions and protons into a PVC membrane is described. The extraction is controlled by the lipophilicity of the anions, while the coextracted protons in conjunctio…

Influence of a Classical Chelate Effect due to a Covalent Linkage of Ionophore Subunits on the Performance of Corresponding Ion Selective Electrodes Open

Werner E. Morf, René Bliggensdorfer, W. Simon · 1989

An lon-Selective Photodiode (ISPD) Open

Philippe M. J. Périsset, Peter C. Hauser, Susie S. S. Tan, K. Seiler, Werner E. Morf , et al. · 1989

A simple ion-selective chemical sensor with an optical transduction (optode) based on a photodiode with limited spectral response is described.

Carriers for chemical sensors: Design features of optical sensors (optodes) based on selective chromoionophores Open

Werner E. Morf, K. Seiler, Beatrice Lehmann, Christoph Behringer, Karel Hartman , et al. · 1989

Design features of ionophores for ion selective electrodes Open

Ernö Pretsch, Martin Badertscher, Martin Welti, Takuya Maruizumi, Werner E. Morf , et al. · 1988

Carbonate-Selective Chromoionophores Open

Christoph Behringer, Beatrice Lehmann, W. Simon · 1987

Three members of a new class of carbonate-selective ion carriers based on trifluoroacetylazobenzene were synthesized and the influence of carbonate on their UV- spectra has been studied.

Intracellular neutral carrier-based Ca2+ microelectrode with subnanomolar detection limit Open

Daniel Ammann, T. B�hrer, U. Schefer, M. M�ller, W. Simon · 1987

Plasticizers of High Lipophilicities for Clinically Relevant Ion-Selective Electrodes (ISE) and Multisensing Field Effect Transistors (ISFET) Open

U. Oesch, Aiping Xu, Zbigniew Brzózka, Gabriela Suter, W. Simon · 1986

Two new types of plasticizers based on tetracarboxylated benzophenone and benzhydrol, respectively, are presented. They exhibit superior performance particularly in ion-selective solvent polymeric membrane electrodes. Their high lipophilic…

Ion-selective membrane electrodes for clinical use. Open

U. Oesch, Daniel Ammann, W. Simon · 1986

We review ion-selective solvent polymeric membrane electrodes for clinical use. The particular requirements that the clinical application set on the membrane are discussed in terms of selectivity, stability, lifetime, and response time. Th…

Lipophilic Neutral Carriers for Lithium Selective Liquid Membrane Electrodes Open

Erich. Metzger, Daniel Ammann, U. Schefer, Ernö Pretsch, W. Simon · 1984

Lipophilic neutral carriers have been designed and characterized in liquid membrane electrodes in view of Li+-activity measurements. One representative shows sufficient selectivities for the measurement of Li+-ions in blood during the ther…

Determination of [K+] in blood serum with a valinomycin-based silicone rubber membrane of universal applicability to body fluids. Open

P. Anker, Hans-Beat Jenny, Urs Wuthier, R. Asper, Daniel Ammann , et al. · 1983

Journal Article Determination of [K+] in blood serum with a valinomycin-based silicone rubber membrane of universal applicability to body fluids. Get access P Anker, P Anker Search for other works by this author on: Oxford Academic Google …

Picoliter Cell Volume Potentiometric Detector for Open-Tubular Column LC Open

A. Manz, W. Simon · 1983

ISSN:0021-9665

Applicability of a Carrier Based Liquid Membrane pH Electrode to Measurements in Acidic Solutions Open

Daniel Erne, K.V. Schenker, D. Ammann, Ernö Pretsch, W. Simon · 1981

A solvent polymeric membrane electrode based on a synthetic H+-carrier is described. The incorporation of the potassium salt of tetrakis(p-chlorophenyl)borate into the membrane phase leads to electrode systems which are suitable for pH mea…

Selective Transport, Coupled to a Counterflow of Protons, of Ions Across Neutral Carrier Membranes Open

Werner E. Morf, S. Arvanitis, W. Simon · 1979

Neutral carrier membranes can transport ions with high selectivity. A specific transport of calcium ions under zero-current conditions has been realized by adding proton carriers to the membrane phase and exposing it to a pH gradient. The …

Liquid Membrane pH Electrode Based on a Synthetic Proton Carrier Open

Daniel Erne, Daniel Ammann, W. Simon · 1979

A new synthetic H+-selective ion-carrier suitable as a component for liquid membrane electrodes is described. Electrodes based on PVC membranes make possible the measurement of physiological H+ ion activities in the presence of typical ext…

On-line continuous potentiometric measurement of potassium concentration in whole blood during open-heart surgery. Open

H. Oßwald, R. Asper, W Dimai, W. Simon · 1979

We describe a flow-through system with an ion-selective electrode for measurement of blood potassium ion concentration, continuously and on-line off the extracorporeal blood circulation in an operating theater during human open-heart surge…

Neutral Carrier Ca2+-Microelectrode Open

Michael Oehme, Manfred A. Kessler, W. Simon · 1976

The use of a synthetic electrically neutral ion carrier in Ca2+- selective microelectrodes is described. High ion-selectivities especially in respect to Na+ and Mg2+ as well as a long lifetime of the electrodes open new possibilities for a…

Enantiomerenselektives Verhalten in Membranen eines chiralen, elektrisch neutralen Ionophors Open

A. P. Thoma, Zvjezdana Cimerman, Ulla Fiedler, Davor Bedeković, M. Güggi , et al. · 1975

A chiral, electrically neutral carrier is shown to possess enantiomer-selective properties in complexation with α-phenylethyl ammonium ions. As measured in e.m.f. and transport experiments, the selectivity for one enantiomer over the other…

Recent developments in the field of ion selective electrodes Open

W. Simon, Ernö Pretsch, Daniel Ammann, Werner E. Morf, M. Güggi , et al. · 1975

Calcium Carrier Properties of Neutral Synthetic Ligands in Bulk Membranes Open

Peter. Wuhrmann, A. P. Thoma, W. Simon · 1973

A group of electrically neutral, acyclic and lipophilic ligands have been found to induce a selective Ca2+ transport through PVC bulk membranes when a potential gradient is applied. An infrared spectroscopic study demonstrated the mobility…

Transient Nutations in 1H{14N} Nuclear Magnetic Double Resonance Open

W. Giger, W. Simon · 1972

Transient nutations in 1H{14N} nuclear magnetic double resonance are described. The high symmetry of the ammonium, tetramethylammonium and tetraethylammonium cations allowed the detection of two different types of transient nutations. One …

Ion selective sensors Open

W. Simon · 1971

Antibiotika-Membranelektrode zur selektiven Erfassung von Ammoniumionenaktivitäten Open

R. P. SCHOLER, W. Simon · 1970

A new liquid-membrane electrode using macrotetrolide antibiotics as ion selective component is described. The electrode shows selectivities of NH4+ over K+ and NH4+ over Na+ of about 10 and over 500 respectively and a linear response to NH…

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