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Probing membrane potential with nonlinear optics

O Bouevitch1, A Lewis, I Pinevsky

  • 1Division of Applied Physics, Hebrew University of Jerusalem, Israel.

Biophysical Journal
|August 1, 1993
PubMed
Summary
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Second harmonic generation, a nonlinear optical process, can now monitor biological membrane voltage. This novel technique offers excellent signal-to-noise for studying cellular electrical activity.

Area of Science:

  • Nonlinear Optics
  • Biophysics
  • Molecular Imaging

Background:

  • Biological membranes maintain voltage crucial for cellular functions.
  • Accurate measurement of membrane potential is vital for understanding cellular processes.
  • Existing methods for monitoring membrane voltage have limitations.

Purpose of the Study:

  • To demonstrate the intrinsic sensitivity of second harmonic generation (SHG) to biological membrane voltage.
  • To establish SHG as a novel tool for monitoring membrane potential changes.
  • To explore the potential applications of SHG in biological systems.

Main Methods:

  • Utilized a chiral styryl dye exhibiting large second harmonic signals.
  • Applied the nonlinear optical process of second harmonic generation.

Related Experiment Videos

  • Measured the voltage across a biological membrane.

    • Main Results:

    • Second harmonic generation showed intrinsic sensitivity to membrane voltage.
    • The SHG process can monitor membrane voltage with excellent signal-to-noise ratio.
    • Demonstrated a novel approach for elucidating membrane potential changes.

    Conclusions:

    • Second harmonic generation is a viable and advantageous method for monitoring membrane voltage.
    • This technique offers significant potential as a new tool in biophysics and cellular biology.
    • Further research into the mechanisms of voltage dependence is warranted.