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Related Concept Videos

Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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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...
748

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Using Cell Membranes as Recognition Layers to Construct Ultrasensitive and Selective Bioelectronic Affinity Sensors.

Eva Vargas1, Fangyu Zhang1, Amira Ben Hassine1

  • 1Department of NanoEngineering and Chemical Engineering Program, University of California San Diego, La Jolla, California 92093, United States.

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|September 16, 2022
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Summary

This study introduces novel bioelectronic affinity sensors using natural cell membranes for protein detection. The innovative design enhances sensitivity and prevents biofouling in complex samples.

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Area of Science:

  • Biomedical Engineering
  • Biosensor Technology
  • Surface Chemistry

Background:

  • Conventional immunosensors face challenges in fabrication and nonspecific adsorption.
  • Antibody-based recognition layers require complex, multi-step surface modifications.
  • Complex biological samples often lead to biofouling and reduced sensor performance.

Purpose of the Study:

  • To develop a novel bioelectronic affinity sensor utilizing natural cell membranes.
  • To overcome limitations of traditional immunosensors, including lengthy fabrication and nonspecific binding.
  • To create a robust platform for sensitive protein detection and biofouling prevention.

Main Methods:

  • Employed a one-step coating process of electrochemical transducers with human macrophage (MΦ) and red blood cell (RBC) membranes.
  • Utilized natural protein receptors on MΦ membranes for target antigen capture.
  • Leveraged RBC membranes to effectively prevent nonspecific adsorption from sample matrices.

Main Results:

  • Demonstrated a highly sensitive detection of tumor necrosis factor alpha (TNF-α) cytokine.
  • Achieved a remarkable limit of detection of 150 pM for TNF-α.
  • Successfully integrated natural cell membranes with electronic transduction for synergistic biosensing.

Conclusions:

  • The developed bioelectronic affinity sensor offers a simplified fabrication process compared to conventional methods.
  • The combined MΦ and RBC membranes provide selective protein recognition and effective biofouling prevention.
  • This cell membrane-based biosensor platform shows significant potential for diverse biosensing applications.