Ionophore-Based Potentiometric Sensors

A special issue of Chemosensors (ISSN 2227-9040).

Deadline for manuscript submissions: closed (30 September 2015) | Viewed by 17747

Special Issue Editor

Analytical Chemistry Laboratory, Department of Chemical Engineering, Åbo Akademi University, Biskopsgatan 8, FI-20500 Åbo-Turku, Finland
Interests: chemical sensors; ion-selective electrodes; solid-contact ises, conducting polymers; potentiometry

Special Issue Information

Dear Colleagues,

Ionophore-based potentiometric sensors or ion-selective electrodes (ISEs) are chemical sensors where host-guest chemistry is utilized to achieve high selectivity to specific ions of interest. A unique feature of ISEs is that they provide information about the free ion concentration (ion activity), which is highly relevant in, e.g., clinical diagnostics, biosciences and environmental monitoring. In today’s modern society there is a clear demand for portable and easy-to-use chemical sensors, such as ISEs, in order to ensure a safe and clean environment, personal health and welfare for the growing population on Earth.

Intensive research in the area of ISEs over the last two decades has resulted in large improvements in the analytical performance of these sensors. Novel transduction mechanisms are continuously being explored and new sensor materials are being developed. The development is going in the direction of printable, disposable and wearable sensors as well as wireless sensor networks.

Nonetheless, despite impressive progress in recent years, ionophore-based sensors still have limitations that prevent their widespread use in everyday life. Obtaining, e.g., calibration-free ISEs still involves major challenges, and the potential benefits are huge. The aim of this Special issue is to bring together new results in research and development that focus on the most recent advances in (i) solid-contact ISEs and solid-contact reference electrodes, (ii) printable ISEs, (iii) disposable ISEs, (iv) wearable ISEs and (v) wireless sensor networks utilizing ISEs.

Prof. Dr. Johan Bobacka
Guest Editor

Manuscript Submission Information

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Keywords

  • ion-selective electrodes
  • ionophore-based potentiometric sensors
  • solid-state ion-to-electron transduction
  • materials and fabrication methods
  • applications

Published Papers (3 papers)

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Research

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576 KiB  
Article
Plasticizer Effects in the PVC Membrane of the Dibasic Phosphate Selective Electrode
by Clifton Carey
Chemosensors 2015, 3(4), 284-294; https://doi.org/10.3390/chemosensors3040284 - 11 Dec 2015
Cited by 12 | Viewed by 4902
Abstract
The PVC membrane of an ion-selective electrode (ISE) sensitive to dibasic phosphate ions (HPO4-ISE) has not been optimized for maximum selectivity, sensitivity, and useable ISE lifetime and further work was necessary to improve its performance. Two areas of investigation are reported [...] Read more.
The PVC membrane of an ion-selective electrode (ISE) sensitive to dibasic phosphate ions (HPO4-ISE) has not been optimized for maximum selectivity, sensitivity, and useable ISE lifetime and further work was necessary to improve its performance. Two areas of investigation are reported here: include the parameters for the lipophilicity of the plasticizer compound used and the amount of cyclic polyamine ionophore incorporated in the PVC membrane. Six candidate plasticizers with a range of lipophilicity were evaluated for their effect on the useable lifetime, sensitivity, and selectivity of the ISE against 13 different anions. Selectivity was determined by a modified fixed interferent method, sensitivity was determined without interferents, and the usable lifetime evaluated at the elapsed time where 50% of the HPO4-ISE failed (L50). The results show that choosing a plasticizer that has a lipophilicity similar to the ionophore’s results in the best selectivity and sensitivity and the longest L50. Full article
(This article belongs to the Special Issue Ionophore-Based Potentiometric Sensors)
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381 KiB  
Article
Carbon Nanotubes-Based Potentiometric Bio-Sensors for Determination of Urea
by Ewa Jaworska, Krzysztof Maksymiuk and Agata Michalska
Chemosensors 2015, 3(3), 200-210; https://doi.org/10.3390/chemosensors3030200 - 24 Jul 2015
Cited by 11 | Viewed by 5801
Abstract
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. This approach has resulted in a potentiometric response on changing [...] Read more.
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. This approach has resulted in a potentiometric response on changing the pH of the solution or NH4+ ion content due to an enzymatic reaction that occurs between urease and urea. Both types of potentiometric biosensors for urea were characterized by good analytical parameters as high sensitivity and fast response time. Full article
(This article belongs to the Special Issue Ionophore-Based Potentiometric Sensors)
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Review

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405 KiB  
Review
Application of Photocured Polymer Ion Selective Membranes for Solid-State Chemical Sensors
by Natalia Abramova and Andrey Bratov
Chemosensors 2015, 3(2), 190-199; https://doi.org/10.3390/chemosensors3020190 - 02 Jun 2015
Cited by 8 | Viewed by 6152
Abstract
Application of conducting polymers with additional functional groups for a solid contact formation and photocurable membranes as sensitive elements of solid-state chemical sensors is discussed. Problems associated with application of UV-curable polymers for sensors are analyzed. A method of sensor fabrication using copolymerized [...] Read more.
Application of conducting polymers with additional functional groups for a solid contact formation and photocurable membranes as sensitive elements of solid-state chemical sensors is discussed. Problems associated with application of UV-curable polymers for sensors are analyzed. A method of sensor fabrication using copolymerized conductive layer and sensitive membrane is presented and the proof of concept is confirmed by two examples of solid-contact electrodes for Ca ions and pH. Full article
(This article belongs to the Special Issue Ionophore-Based Potentiometric Sensors)
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