Results 31 to 40 of about 14,868 (222)

Two Versatile Pencil Graphite–Polymer Sensor Electrodes Coupled with Potentiometry and Potentiometric Titration Methods: Profiling Determinations of Vitamin V in Tablets and Urine Samples

Sensors, 2022
Herein, we developed a new pencil graphite ion-selective electrode strategy for the broadly used erectile dysfunction medication, sildenafil citrate (SC, vitamin V), for its automated potentiometry and potentiometric titration profiling in marketed ...
Abeer M. E. Hassan, Mohamed A. El Hamd, Mahmoud H. El-Maghrabey, Wael A. Mahdi, Sultan Alshehri, Hany A. Batakoushy   +5 more
doaj   +1 more source

Carbon Nanotubes-Based Potentiometric Bio-Sensors for Determination of Urea

Chemosensors, 2015
The possibility of using disposable plastic-carbon potentiometric sensors as enzyme biosensors was examined. Urease enzyme was immobilized on poly(vinyl chloride) based H+- or NH4+-selective membranes using cellulose acetate.
Ewa Jaworska, Krzysztof Maksymiuk, Agata Michalska   +2 more
doaj   +1 more source

The New Ion-Selective Electrodes Developed for Ferric Cations Determination, Modified with Synthesized Al and Fe−Based Nanoparticles

Sensors, 2021
The solid-state ion-selective electrodes presented here are based on the FePO4:Ag2S:polytetrafluoroethylene (PTFE) = 1:1:2 with an addition of (0.25–1)% microwave-synthesized hematite (α-Fe2O3), magnetite (Fe3O4), boehmite [γ-AlO(OH)], and alumina (Al2O3)
Andrea Paut, Ante Prkić, Ivana Mitar, Lucija Guć, Marijan Marciuš, Martina Vrankić, Stjepko Krehula, Lara Tomaško   +7 more
doaj   +1 more source

Monitoring Physiological Changes in Haloarchaeal Cell during Virus Release

Viruses, 2016
The slow rate of adsorption and non-synchronous release of some archaeal viruses have hindered more thorough analyses of the mechanisms of archaeal virus release.
Julija Svirskaitė, Hanna M. Oksanen, Rimantas Daugelavičius, Dennis H. Bamford   +3 more
doaj   +1 more source

Chloride Ion-Selective Electrode with Solid-Contact Based on Polyaniline Nanofibers and Multiwalled Carbon Nanotubes Nanocomposite

Membranes, 2022
Use of the nanocomposite of chloride-doped polyaniline nanofibers and multiwalled carbon nanotubes (PANINFs-Cl:MWCNTs) for construction of ion-selective electrodes with solid-contact sensitive to chloride ions has been described. Many types of electrodes
Karolina Pietrzak, Klaudia Morawska, Szymon Malinowski, Cecylia Wardak   +3 more
doaj   +1 more source

Potentiometric Determination of Moxifloxacin by Solid-Contact ISEs in Wastewater Effluents

Chemosensors, 2022
In recent years, the use of ion-selective membranes in the sensing and assessment of environmental contaminants has become a critical goal. Using sodium tetraphenylborate (TPB) and phosphotungstic acid (PTA) as ion-pairing agents, two sensitive and ...
Sherif A. Abdel-Gawad, Hany H. Arab, Ahmed A. Albassam   +2 more
doaj   +1 more source

Galvanic Redox Potentiometry for Self-Driven in Vivo Measurement of Neurochemical Dynamics at Open-Circuit Potential.

Analytical Chemistry, 2018
Understanding the real-time correlation between chemical patterns and neural processes is critical for deciphering brain function. Voltammetry has enabled this task but with a number of challenges for current-based electrolysis in vivo. Herein, we report
Fei Wu, Hanjun Cheng, Huan Wei, Tianyi Xiong, Ping Yu, L. Mao   +5 more
semanticscholar   +1 more source

Scanning tunneling potentiometry of semiconductor junctions

, 2018
A method for performing scanning tunneling potentiometry of semiconductor heterojunctions is described. The method yields a direct measure of the electrostatic potential distribution across the interface, with microscopic resolution.
Randall Feenstra (3885121), R. Hey (5388254), Yang Dong (5388257), K. H. Ploog (5388260)   +3 more
core   +1 more source

Enzyme Kinetics via Open Circuit Potentiometry

, 2020
We demonstrate the application of open circuit potentiometry (OCP) to measure enzyme turnover kinetics, kturn. The electrode surface will become poised by the addition of a well-behaved redox pair such as ferrocenemethanol/ferrocenium methanol (FcMeOH ...
Glasscott, Matthew, Vannoy, Kathryn, Smith, Lettie   +2 more
core   +1 more source

Potentiometric Performance of Ion-Selective Electrodes Based on Polyaniline and Chelating Agents: Detection of Fe²⁺ or Fe³⁺ Ions

Biosensors, 2022
We constructed a sensor for the determination of Fe2+ and/or Fe3+ ions that consists of a polyaniline layer as an ion-to-electron transducer; on top of it, chelating molecules are deposited (which can selectively chelate specific ions) and protected with
Rimeh Ismail, Ivana Šeděnková, Zulfiya Černochová, Iryna Romanenko, Ognen Pop-Georgievski, Martin Hrubý, Elena Tomšík   +6 more
doaj   +1 more source