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Related Concept Videos

Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.

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Simultaneous Multicolor Imaging of Biological Structures with Fluorescence Photoactivation Localization Microscopy
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Dual-factor triggered fluorogenic nanoprobe for ultrahigh contrast and subdiffraction fluorescence imaging.

Zhe Wang1, Xiaoxiang Zhang, Peng Huang

  • 1Laboratory of Molecular Imaging and Nanomedicine, National Institute of Biomedical Imaging and Bioengineering (NIBIB), National Institutes of Health, Bethesda, MD 20892, USA.

Biomaterials
|June 1, 2013
PubMed
Summary

Researchers developed a novel near-infrared (NIR) fluorogenic nanoprobe (fg-nanoprobe) for ultrahigh contrast molecular imaging. This probe offers improved signal-to-noise ratio and enables super-resolution imaging, advancing fluorescence molecular imaging applications.

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Area of Science:

  • Biomedical Imaging
  • Nanotechnology
  • Optical Spectroscopy

Background:

  • Ultrahigh contrast fluorescence molecular imaging is crucial for basic science and clinical applications.
  • Existing near-infrared (NIR) molecular probes often struggle to achieve high quantum yield, signal-to-noise (S/N) ratio, and responsiveness to microenvironmental changes.

Purpose of the Study:

  • To develop a novel fluorogenic nanoprobe (fg-nanoprobe) utilizing a new NIR dye for ultrahigh contrast in vitro and in vivo molecular imaging.
  • To leverage synergistic effects for enhanced S/N ratio and explore pH-tunable fluorescence properties.
  • To integrate the nanoprobe with super-resolution imaging techniques.

Main Methods:

  • Synthesis of a novel NIR dye and its incorporation into a fluorogenic nanoprobe (fg-nanoprobe).
  • Evaluation of the fg-nanoprobe's performance for in vitro and in vivo imaging, focusing on contrast and S/N ratio.
  • Investigation of cellular compartmental triggered fluorogenicity and pH-tunable fluorescence characteristics.
  • Coupling the nanoprobe with image processing for super-resolution subdiffraction imaging.

Main Results:

  • The developed fg-nanoprobe achieved ultrahigh contrast imaging with negligible background interference.
  • The S/N ratio was significantly enhanced due to synergistic effects of cellular compartmental triggered fluorogenicity and pH-tunable fluorescence.
  • The nanoprobe demonstrated potential for super-resolution subdiffraction imaging when combined with advanced image processing.
  • The probe successfully integrated the photophysical properties of the NIR fluorophore with the advantages of engineered nanoparticles.

Conclusions:

  • The novel NIR fg-nanoprobe offers a promising platform for ultrahigh contrast fluorescence molecular imaging.
  • The probe's design overcomes limitations of existing probes by enhancing S/N ratio and environmental responsiveness.
  • This development may pave the way for new avenues in advanced fluorescence molecular imaging for future research and clinical diagnostics.