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Related Experiment Videos

Practical limits on the maximal speed of solution exchange for patch clamp experiments.

F Sachs1

  • 1Department of Physiology and Biophysics, State University of New York at Buffalo, Buffalo, New York 14214, USA. sachs@buffalo.edu

Biophysical Journal
|July 29, 1999
PubMed
Summary

Dual stream switchers enable rapid solution exchange for studying ligand-gated ion channels. Finite element models reveal practical limitations, with a ~20 microsecond rise time achievable, limited by motor velocity.

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Area of Science:

  • Biophysics
  • Neuroscience
  • Ion Channel Physiology

Background:

  • Studying ligand-gated ion channels necessitates rapid solution exchange.
  • Existing methods face limitations in achieving swift and precise solution delivery.

Purpose of the Study:

  • To examine the practical limitations of solution exchange speed on an outside-out patch using a dual stream switcher.
  • To identify key factors influencing the response time of solution exchange.

Main Methods:

  • Utilized finite element modeling to simulate solution exchange dynamics.
  • Analyzed parameters including flow velocity, stream proximity, partition width, stream movement velocity, and perfusate viscosity.

Main Results:

  • Identified a practical rise time limit of approximately 20 microseconds for solution exchange.

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  • Determined that the velocity of the motor translating the streams is the rate-limiting step.
  • Found that increasing perfusate viscosity enhances speed by reducing concentration gradient dissipation.

    • Conclusions:

    • Dual stream switchers offer rapid solution exchange for ion channel research.
    • Finite element modeling provides insights into optimizing solution exchange parameters.
    • The technology also supports rapid temperature jumps with a ~100 microsecond rise time.