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Patch Clamp01:18

Patch Clamp

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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.
In this method, a glass micropipette containing electrolyte solution is tightly sealed against a small portion of the cell membrane. As a result, a patch of the cell...
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Related Experiment Video

Updated: Apr 7, 2026

Dynamic Clamp Methods to Investigate Impaired Neuronal Excitability Associated with Autism
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Dynamics of T-Junction Solution Switching Aimed at Patch Clamp Experiments.

Jerónimo A Auzmendi1, Mariano Smoler1, Luciano Moffatt1

  • 1Instituto de Química Física de los Materiales, Medio Ambiente y Energía. Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina.

Plos One
|July 16, 2015
PubMed
Summary

Improving upstream solution exchange in patch clamp experiments is crucial for drug discovery. This study reveals how pressure, distance, and pipette position affect solution switching times, optimizing drug application timing.

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Area of Science:

  • Biophysics
  • Pharmacology
  • Neuroscience

Background:

  • Accurate solution exchange timing is critical for patch clamp electrophysiology.
  • Current methods for solution exchange have limitations in speed and reproducibility, especially for upstream systems.
  • Optimizing upstream exchange enhances the efficiency of drug screening and physiological studies.

Purpose of the Study:

  • To investigate factors influencing solution exchange timing in patch clamp experiments.
  • To develop a simple method for manufacturing T-junctions for improved upstream exchange.
  • To provide insights for designing better serial compound exchangers for drug discovery.

Main Methods:

  • Manufactured T-junctions with a 300 μm inner diameter.
  • Measured solution exchange time profiles using a patch pipette with an open tip.
  • Analyzed the effects of pressure, travelled distance, and off-center distance on exchange timing.

Main Results:

  • Exchange timing depends linearly on travelled distance and fluid velocity (pressure-dependent).
  • Exchange time increases quadratically with time delay, with unexplained variability.
  • Pipette position significantly impacts exchange delay and time, with dramatic effects near stream borders.
  • Mass transport along the travelled distance contributes to exchange time course.

Conclusions:

  • Pipette positioning and fluid dynamics are key factors in optimizing solution exchange.
  • Understanding these factors can lead to improved designs for serial compound exchangers.
  • This research aids in the discovery of drugs modulating ion channel activity for physiological fine-tuning.