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Related Concept Videos

Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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 the...

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Double-barreled and Concentric Microelectrodes for Measurement of Extracellular Ion Signals in Brain Tissue
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How to make calcium-sensitive minielectrodes.

Roger C Thomas1, Donald M Bers

  • 1Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge CB2 3EG, United Kingdom. rct26@cam.ac.uk

Cold Spring Harbor Protocols
|April 3, 2013
PubMed
Summary
This summary is machine-generated.

This protocol details the creation and application of calcium ion (Ca2+) minielectrodes for precise measurements in small liquid volumes. These durable, low-resistance electrodes offer a cost-effective solution for extended use.

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Area of Science:

  • Analytical Chemistry
  • Electrochemistry
  • Biomedical Engineering

Background:

  • Accurate measurement of calcium ion (Ca2+) concentrations is crucial in various scientific disciplines.
  • Existing methods for Ca2+ detection may be limited in small sample volumes or require specialized equipment.
  • Development of accessible and reliable Ca2+ sensing tools is an ongoing need.

Purpose of the Study:

  • To describe a protocol for fabricating and utilizing minielectrodes for Ca2+ measurements.
  • To present a method for creating low-resistance, miniaturized electrodes suitable for small solution volumes.
  • To highlight the cost-effectiveness and longevity of the developed Ca2+ minielectrodes.

Main Methods:

  • Fabrication of minielectrodes (~2 mm diameter) by dipping glass or polyethylene tubes in a membrane solution.
  • Utilizing standard pH meters for Ca2+ measurements due to the electrodes' low resistance.
  • Assessing the useful life and production capacity of the fabricated electrodes.

Main Results:

  • Successfully developed minielectrodes for measuring Ca2+ in small volumes.
  • Demonstrated that the minielectrodes possess sufficiently low resistances for use with standard pH meters.
  • Showcased the potential to produce hundreds of electrodes from a single batch of expensive chemicals, with each electrode lasting several months.

Conclusions:

  • The described protocol provides a viable method for producing Ca2+-sensitive minielectrodes.
  • These minielectrodes are practical for Ca2+ quantification in small sample volumes, offering a balance of performance and cost.
  • The developed electrodes represent a valuable tool for researchers requiring sensitive and long-lasting Ca2+ detection capabilities.