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Potentiometry: Membrane Electrodes

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...

What are Membranes?

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A key characteristic of life is the ability to separate the external environment from the internal space. To do this, cells have evolved semi-permeable membranes that regulate the passage of biological molecules. Additionally, the cell membrane defines a cell’s shape and interactions with the external environment. Eukaryotic cell membranes also serve to compartmentalize the internal space into organelles, including the endomembrane structures of the nucleus, endoplasmic reticulum and Golgi...

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A cell's plasma membrane demarcates the cell's borders and determines the nature of its interaction with the environment. Cells exclude certain substances, take in others, and excrete some others in controlled quantities. The plasma membrane must be flexible to allow certain cells, such as red and white blood cells, to change their shape while passing through narrow capillaries. These are the more obvious plasma membrane functions. In addition, the plasma membrane's surface carries markers that...

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Related Experiment Video

Updated: May 12, 2026

Assembly and Characterization of Biomolecular Memristors Consisting of Ion Channel-doped Lipid Membranes

Assembly and Characterization of Biomolecular Memristors Consisting of Ion Channel-doped Lipid Membranes

Published on: March 9, 2019

Charged membranes.

Jack D Thatcher¹

¹West Virginia School of Osteopathic Medicine, 400 North Lee Street, Lewisburg, WV 24901, USA. jthatcher@osteo.wvsom.edu

Science Signaling

|April 18, 2013

Summary

Learn how plasma membranes store and use energy through animated lessons on sodium-potassium pumps, ATP synthesis, and neural action potentials for collegiate biology and physiology courses.

Area of Science:

Cell Biology
Biophysics
Physiology

Background:

Plasma membranes are crucial for cellular energy management.
Understanding energy storage and utilization is fundamental in biological sciences.

Purpose of the Study:

To provide animated, collegiate-level teaching resources on plasma membrane energy dynamics.
To illustrate key concepts in cellular energy transfer and signaling.

Main Methods:

Development of three animated lessons: Na,K ATPase, ATP synthesizing complexes, and action potential.
Focus on the mechanisms of energy storage and utilization across membranes.

Main Results:

The Na,K ATPase animation details electrochemical gradient formation.

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Membrane Remodeling of Giant Vesicles in Response to Localized Calcium Ion Gradients

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Introduction to Solid Supported Membrane Based Electrophysiology

Published on: May 11, 2013

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Last Updated: May 12, 2026

Assembly and Characterization of Biomolecular Memristors Consisting of Ion Channel-doped Lipid Membranes

Assembly and Characterization of Biomolecular Memristors Consisting of Ion Channel-doped Lipid Membranes

Published on: March 9, 2019

Membrane Remodeling of Giant Vesicles in Response to Localized Calcium Ion Gradients

Membrane Remodeling of Giant Vesicles in Response to Localized Calcium Ion Gradients

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Introduction to Solid Supported Membrane Based Electrophysiology

Introduction to Solid Supported Membrane Based Electrophysiology

Published on: May 11, 2013

The ATP synthesis animation explains energy transfer to adenosine triphosphate (ATP).

The action potential animation illustrates signal propagation via charged membranes.

Conclusions:

These animations offer valuable visual aids for teaching cellular energy processes.
The resources are suitable for introductory biology, biochemistry, biophysics, cell biology, pharmacology, and physiology courses.