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Two-photon interactions at single fluorescent molecule level.

Fabio Cannone1, Giuseppe Chirico, Alberto Diaspro

  • 1National Institute for the Physics of Matter, Laboratory for Advanced, Microscopy, Bioimaging, and Spectroscopy, Genoa, Italy.

Journal of Biomedical Optics
|July 26, 2003
PubMed
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This study demonstrates single-molecule detection using two-photon excitation microscopy. Researchers analyzed fluorescent dyes and protein denaturation, highlighting applications in biological and medical fields.

Area of Science:

  • Optics and Spectroscopy
  • Biophysics
  • Materials Science

Background:

  • Single-molecule spectroscopy and detection are advancing fields with broad applications.
  • Combining these techniques with scanning, imaging, and spectroscopy enhances analytical capabilities.

Purpose of the Study:

  • To investigate two-photon excitation fluorescence detection of various dyes.
  • To analyze the photophysical behavior (blinking, photobleaching) of single fluorescent molecules.
  • To study protein denaturation at the single-molecule level.

Main Methods:

  • Utilized a commercial confocal scanning head integrated with a Ti:sapphire laser and an inverted microscope.
  • Employed two-photon excitation for single-molecule fluorescence detection.
  • Collected spot images of fluorescent molecules (Indo-1, Rhodamine 6G, Fluorescein, Pyrene) on a substrate.

Related Experiment Videos

  • Investigated enhanced green fluorescent protein (GFPmut2) denaturation under one-photon excitation.

    • Main Results:

    • Presented data on two-photon interactions with Indo-1, Rhodamine 6G, Fluorescein, and Pyrene.
    • Observed blinking and photobleaching behaviors of single fluorescent spots.
    • Reported single-molecule denaturation data for GFPmut2 showing trends similar to small molecules.

    Conclusions:

    • The developed system enables effective single-molecule fluorescence detection and analysis.
    • The study provides insights into the photophysical properties of various fluorescent dyes and protein dynamics.
    • Findings are relevant for biological and medical applications requiring sensitive molecular detection.