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Related Concept Videos

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In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
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Potentiometry is an analytical technique that measures the potential difference between two electrodes in an electrochemical cell without drawing any significant current that could alter the solution's composition. This method employs an indicator electrode, which exchanges electrons with the analyte solution, and a reference electrode with a constant potential. Each electrode is immersed in a solution comprised of two half-cells. In a conventional setup, the reference electrode serves as...
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Related Experiment Video

Updated: Mar 4, 2026

Use of Label-free Optical Biosensors to Detect Modulation of Potassium Channels by G-protein Coupled Receptors
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A highly selective, colorimetric, and environment-sensitive optical potassium ion sensor.

Guangjie Song1, Ruofan Sun, Jiqing Du

  • 1Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China. tianyq@sustc.edu.cn.

Chemical Communications (Cambridge, England)
|April 20, 2017
PubMed
Summary

A new colorimetric sensor, KS7, detects potassium ions (K+) with a visible color change. This sensor offers a wide detection range for biological and environmental samples, enabling convenient testing.

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Area of Science:

  • Analytical Chemistry
  • Chemical Sensors
  • Biomedical Diagnostics

Background:

  • Potassium ions (K+) are crucial for numerous biological functions.
  • Highly selective K+ sensors are essential for disease diagnosis and health monitoring.
  • Existing sensors may lack the sensitivity or range for diverse applications.

Purpose of the Study:

  • To develop a novel colorimetric sensor for the detection of potassium ions (K+).
  • To evaluate the sensor's performance, including its response range and selectivity.
  • To demonstrate the practical application of the sensor in real-world samples.

Main Methods:

  • A hemicyanine dye was employed as a fluorophore.
  • Phenylaza-[18]crown-6 lariat ether (ACLE) was used as the K+ ligand.
  • Spectrophotometric analysis was performed to observe spectral changes upon K+ addition.

Main Results:

  • The developed sensor (KS7) showed a significant hypsochromic shift of 77 nm (515 to 438 nm) with an isosbestic point at 452 nm.
  • A distinct color change from red to yellow was observed upon K+ binding.
  • The sensor demonstrated a wide linear response range for K+ from 1 to 200 mM.

Conclusions:

  • The KS7 sensor provides a sensitive and selective method for colorimetric K+ detection.
  • Its wide detection range makes it suitable for analyzing cellular, urinary, and environmental samples.
  • Filter paper-based test strips were successfully developed for convenient on-site K+ detection, particularly in urine.