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Related Concept Videos

Immunogold Electron Microscopy01:20

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Immunoelectron microscopy utilizes immunogold labeling of endogenous proteins with specific antibodies to detect and localize these proteins in cells and tissues. The procedure provides insights into the distribution and quantification of protein under different stimulation conditions offering clues about their functions. Conjugating highly electron-dense gold particles with primary or secondary antibodies allow antigen detection on and within cells, with high resolution and specificity.
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Related Experiment Video

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Rapid Nanoprobe Signal Enhancement by In Situ Gold Nanoparticle Synthesis
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An x-ray fluorescence imaging system for gold nanoparticle detection.

K Ricketts1, C Guazzoni, A Castoldi

  • 1Department of Medical Physics and Bioengineering, University College London, UK.

Physics in Medicine and Biology
|October 23, 2013
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Summary

High-sensitivity X-ray fluorescence imaging detects gold nanoparticles (GNPs) for tumor detection. This method offers greater depth penetration than optical imaging, enabling in vivo and in vitro studies.

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Area of Science:

  • Medical Imaging
  • Nanotechnology
  • Biophysics

Background:

  • Gold nanoparticles (GNPs) show promise as contrast agents for tumor localization and imaging specific biological parameters.
  • Current imaging systems lack the sensitivity and depth penetration required for in vivo and in vitro GNP concentration and distribution measurement.

Purpose of the Study:

  • To demonstrate the high sensitivity and depth imaging capabilities of X-ray fluorescence (XRF) for gold nanoparticle (GNP) detection.
  • To develop and evaluate two XRF systems for quantitative imaging of GNP concentration at sufficient tissue depths.

Main Methods:

  • Development of two XRF systems: one with a silicon drift detector and polycapillary optic for 2D imaging, and another utilizing a pixellated detector for wide-beam excitation and scanning-free acquisition.
  • Imaging of GNP phantoms to assess sensitivity, resolution, and depth penetration.

Main Results:

  • The first XRF system achieved sensitivity to GNP concentrations as low as 1 ppm, resolving differences by a factor of 5.
  • The second system demonstrated feasibility for scanning-free imaging with positional accuracy.
  • Sufficient tissue penetration for near-surface small-animal studies and 3D in vitro cellular constructs was confirmed.

Conclusions:

  • X-ray fluorescence imaging offers high sensitivity and depth penetration for detecting gold nanoparticles, surpassing optical modalities.
  • The developed XRF systems show strong potential for quantitative imaging of GNP concentration in biological samples.
  • This technique could advance in vivo and in vitro tumor detection and characterization using gold nanoparticles.