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Surface Modified Thread-Based Microfluidic Analytical Device for Selective Potassium Analysis.

Miguel M Erenas1, Ignacio de Orbe-Payá1, Luis Fermin Capitan-Vallvey1

  • 1Department of Analytical Chemistry, Campus Fuentenueva, Faculty of Sciences, 18071, University of Granada , Granada, Spain.

Analytical Chemistry
|April 15, 2016
PubMed
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This study introduces a novel thread-based microfluidic device for potassium detection. The simple, low-cost device uses color change for accurate optical recognition of potassium ions.

Area of Science:

  • Analytical Chemistry
  • Microfluidics
  • Sensing Technology

Background:

  • Potassium ion (K+) detection is crucial in various fields, including clinical diagnostics and environmental monitoring.
  • Existing methods for potassium detection can be complex, expensive, or require specialized equipment.

Purpose of the Study:

  • To develop a simple, low-cost, and portable microfluidic device for the optical determination of potassium ions.
  • To utilize ionophore extraction chemistry and colorimetric analysis for sensitive and selective potassium detection.

Main Methods:

  • A thread-based microfluidic device (μTAD) was fabricated using a cotton thread for sample transport via capillary action.
  • Ionophore extraction chemistry was deposited onto the detection area of the thread for potassium recognition.

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  • Optical detection was performed using a digital camera, analyzing the H coordinate of the HSV color space.

    • Main Results:

    • The μTAD demonstrated rapid equilibrium (60 s) and a distinct color change (blue to magenta) upon potassium binding.
    • The device enabled the determination of potassium concentrations ranging from 2.4 × 10⁻⁵ to 0.95 M.
    • High precision (better than 1.3%) was achieved in potassium ion quantification.

    Conclusions:

    • The developed thread-based microfluidic device offers a promising platform for portable and cost-effective potassium sensing.
    • The combination of microfluidics, ionophore chemistry, and digital imaging provides a sensitive and accurate method for potassium analysis.