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An improved liquid ion exchanger for chloride ion-selective microelectrodes
The American Journal of Physiology
|November 1, 1981
Summary
A novel chloride liquid ion exchanger enhances ion-selective microelectrode (ISE) performance. This new material offers superior properties, including higher yield and improved selectivity, making it ideal for fine-tip and multi-barrel ISE applications.
Area of Science:
- Electrochemistry
- Analytical Chemistry
- Biomedical Engineering
Background:
- Ion-selective electrodes (ISEs) are crucial for measuring ion concentrations in biological systems.
- Existing chloride ISEs have limitations in performance and fabrication, particularly for microscale applications.
- A need exists for improved ion-exchanger materials to enhance ISE capabilities.
Purpose of the Study:
- To introduce and characterize a new chloride liquid ion exchanger (Corning 477913) for fabricating ion-selective microelectrodes (ISEs).
- To compare the performance of ISEs made with the new exchanger against those made with a standard exchanger (Corning 477315).
- To evaluate the suitability of the new exchanger for intracellular chloride activity measurements.
Main Methods:
- Fabrication of ISEs using a novel chloride liquid ion exchanger (Corning 477913) with a fivefold higher organophilic ligand concentration.
- Characterization of ISE properties including tip diameter, yield, electrical resistance, slope, and selectivity.
- Measurement of intracellular chloride activity in rabbit ventricle tissue using the newly fabricated ISEs.
Main Results:
- ISEs fabricated with Corning 477913 demonstrated superior properties compared to those made with Corning 477315.
- Key improvements included a significantly higher yield (77% vs. 34%), a 5.3-fold decrease in ISE resistance, and an improved average slope (-52.8 mV vs. -45.5 mV).
- Enhanced selectivity over interfering anions and satisfactory performance in intracellular chloride measurements were observed.
Conclusions:
- The new chloride liquid ion exchanger (Corning 477913) offers significant advantages for ISE fabrication, particularly for microelectrodes.
- Its improved properties make it suitable for biological applications, including intracellular measurements.
- The formulation is particularly beneficial for creating very fine-tip ISEs and multi-barrel ISE configurations.