Solid contact potassium selective electrodes for biomedical applications - a review

Area of Science:

• Electrochemistry
• Materials Science
• Biomedical Engineering

Background:

• Ion-selective electrodes (ISEs) are crucial for measuring potassium concentration in biological samples.
• Miniaturization is essential for on-site and advanced biomedical applications.
• Solid contacts are replacing liquid contacts in ISEs, enabling industrial production of miniaturized sensors.

Purpose of the Study:

• To review recent developments in solid-state ISEs for potassium sensing.
• To critically compare different solid contact materials for potassium ISEs.
• To discuss future prospects of miniaturized ISEs in biomedical applications.

Main Methods:

• Comparison of polypyrrole, polythiophenes, and conducting nanomaterials as solid contact layers.
• Analysis of stability, selectivity, and response time of various solid-state potassium ISEs.
• Review of recent innovations in sensor design and operational methods.

Main Results:

• Solid contact materials significantly enhance the stability, selectivity, and response time of potassium ISEs.
• New materials have enabled numerous performance improvements in solid-state ISEs.
• Advancements include flexible sensors and multi-electrode designs for small sample volumes.

Conclusions:

• Solid-state ISEs represent a significant advancement for potassium determination in biomedical settings.
• Future developments focus on miniaturized, flexible, and multi-analyte sensors for point-of-care applications.
• These technologies hold promise for real-time monitoring of electrolyte concentrations and ionic flows.