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Ion sensing with thread-based potentiometric electrodes.

Maral P S Mousavi1, Alar Ainla, Edward K W Tan

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Summary
This summary is machine-generated.

Researchers developed robust, miniaturized ion-selective electrodes (ISEs) using cotton thread for point-of-care diagnostics. These thread-based sensors offer sensitive ion detection in various samples, including clinical diagnostics, overcoming limitations of traditional lab-based ISEs.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Analytical Chemistry

Background:

  • Ion-selective electrodes (ISEs) are crucial for ion analysis but are typically large, delicate, and lab-bound.
  • Existing ISEs are unsuitable for portable, point-of-care, or point-of-use applications due to their size and fragility.

Purpose of the Study:

  • To develop miniaturized, robust, and cost-effective ion-selective electrodes using cotton thread as a substrate.
  • To enable point-of-care or point-of-use potentiometric sensing of various ions in diverse matrices.

Main Methods:

  • Fabrication of thread-based ISEs by coating cotton thread with conductive ink (carbon black for cations, Ag/AgCl for chloride).
  • Development of ISEs selective for chloride (Cl-), potassium (K+), sodium (Na+), and calcium (Ca2+).
  • Testing sensor performance across four orders of magnitude of ion concentrations.

Main Results:

  • Thread-based ISEs demonstrated theoretical Nernstian slopes for target ions.
  • Sensors showed mechanical robustness suitable for multiple or single-use applications.
  • Successful ion analysis in soil, food, dietary supplements, blood serum, and urine samples with high accuracy.

Conclusions:

  • Cotton thread is a viable substrate for fabricating miniaturized, robust ISEs for portable ion sensing.
  • These thread-based ISEs are suitable for point-of-care diagnostics and analysis in complex samples.
  • The developed sensors offer a low-volume, high-performance alternative to traditional laboratory-based ISEs.