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Related Experiment Videos

An automatic temperature-control system for solutions in free flow

F Lacaz-Vieira1, A P Filho

  • 1Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, 05508-900 São Paulo, Brazil.

Pflugers Archiv : European Journal of Physiology
|February 4, 1999
PubMed
Summary

This study introduces a compact temperature-control system for precise solution temperature regulation during electrophysiological and optical studies. It enables rapid solution changes for cell preparations, maintaining consistent temperatures for improved experimental accuracy.

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Area of Science:

  • Physiology
  • Biophysics
  • Biotechnology

Background:

  • Electrophysiological and optical studies require precise control over solution temperature.
  • Rapid solution exchange is crucial for studying dynamic cellular responses.
  • Existing systems may lack compactness or rapid switching capabilities.

Purpose of the Study:

  • To develop and describe a compact, free-flow temperature-control system for biological preparations.
  • To enable rapid solution switching for Ussing chamber applications.
  • To ensure stable temperature maintenance during solution changes.

Main Methods:

  • A compact monoblock heating unit coupled with a proportional controller.
  • Integration with a modified, continuous-flow Ussing chamber.

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  • Use of microvalves for rapid switching between temperature-controlled and room/ice-bath temperature solutions.

    • Main Results:

    • The system maintains stable fluid temperature (e.g., 37°C) at the outlet for flow rates from 1.0 to 12 ml/min.
    • Rapid solution switching is achieved without significant temperature fluctuations at the outlet.
    • The system allows for preset temperature control above the incoming fluid temperature.

    Conclusions:

    • The described temperature-control system is suitable for electrophysiological and optical studies requiring precise and rapidly changeable solution temperatures.
    • Its compact design and Ussing chamber compatibility enhance experimental flexibility and accuracy.
    • This system facilitates the study of isolated cells, epithelia, and cell monolayers under controlled physiological conditions.