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Use of Label-free Optical Biosensors to Detect Modulation of Potassium Channels by G-protein Coupled Receptors
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Non-Equilibrium Diffusion Controlled Ion-Selective Optical Sensor for Blood Potassium Determination.

Xinfeng Du1, Xiaojiang Xie1

  • 1Department of Chemistry, Southern University of Science and Technology , Shenzhen, 518055, P. R. China.

ACS Sensors
|September 27, 2017
PubMed
Summary

We developed a novel optical sensor to measure potassium levels in undiluted blood and plasma. This simple method uses color propagation to quantify potassium ions, paving the way for new diagnostic tools.

Keywords:
blood electrolytesdistancehydrogelsion selective optodessensors

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Clinical Diagnostics

Background:

  • Blood electrolyte measurements are crucial for clinical diagnostics.
  • There is a demand for simple, elegant optical ion sensors.
  • Current methods for potassium measurement can be complex.

Purpose of the Study:

  • To present an analytical method for quantifying potassium ions in undiluted human blood and plasma.
  • To develop a novel optical ion sensor based on color propagation.
  • To establish a theoretical model supporting the experimental findings.

Main Methods:

  • Utilized K+-selective nanospheres embedded in an agarose hydrogel.
  • Employed a diffusion-controlled mass transport system.
  • Measured the distance and rate of color propagation to quantify potassium (K+) activity.

Main Results:

  • The sensor demonstrated a linear relationship between color change (distance/rate) and the logarithm of K+ activity.
  • A theoretical model was established and validated the experimental results.
  • The method allows for quantification in undiluted human blood and plasma.

Conclusions:

  • This work introduces a new family of optical ion sensors for direct electrolyte determination.
  • The developed sensor offers a simple and elegant approach for clinical diagnostics.
  • The findings support the potential for widespread application in blood electrolyte analysis.