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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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Many fundamental cell functions such as muscle contraction and nerve transmission rely on the electrical signals produced by the movement of positively and negatively charged ions across the cell membrane. One competent method to record current flowing across the whole cell or single ion channel is the patch-clamp technique.
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The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
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Updated: Jun 21, 2026

Introduction to Solid Supported Membrane Based Electrophysiology
19:56

Introduction to Solid Supported Membrane Based Electrophysiology

Published on: May 11, 2013

Measuring ion channels on solid supported membranes.

Patrick Schulz1, Benjamin Dueck, Alexandre Mourot

  • 1Max Planck Institut für Biophysik, D-60438 Frankfurt/Main, Germany.

Biophysical Journal
|July 8, 2009
PubMed
Summary
This summary is machine-generated.

Solid supported membranes (SSMs) enable functional investigation of ion channels using electrophysiology. This method allows for robust, automatic assays and characterization of ion channels where traditional methods fail.

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Area of Science:

  • Biophysics
  • Membrane Biology
  • Electrophysiology

Background:

  • Solid supported membranes (SSMs) have been previously used for active transport systems.
  • Electrophysiology is a key technique for studying ion transport.
  • Investigating ion channels often requires specialized techniques.

Purpose of the Study:

  • To present the application of solid supported membranes (SSMs) for functional investigation of ion channels.
  • To expand SSM-based electrophysiology for ion channel analysis.
  • To demonstrate the utility of SSMs for ion channel characterization.

Main Methods:

  • Ion channels reconstituted into membranes or liposomes were adsorbed onto SSMs.
  • Concentration gradients of permeant ions were applied across the SSMs.
  • Transient currents were recorded via capacitive coupling to represent ion channel activity.

Main Results:

  • The technique was successfully applied to gramicidin, nicotinic acetylcholine receptors, and P2X2 receptors.
  • Stable ion gradients were applied, yielding recordings with an excellent signal/noise ratio.
  • High assay quality factors (Z' = 0.55 for nAChR, Z' = 0.67 for P2X2) were achieved.

Conclusions:

  • SSM-based electrophysiology provides a novel approach for ion channel functional investigation.
  • This technique is particularly useful for ion channels where conventional electrophysiology is challenging, such as those in intracellular compartments.
  • The method facilitates robust, fully automated assays suitable for drug screening.