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Detection of Fluorescent Nanoparticle Interactions with Primary Immune Cell Subpopulations by Flow Cytometry
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Enhanced flow cytometry-based bead immunoassays using metal nanostructures.

Wei Deng1, Krystyna Drozdowicz-Tomsia, Dayong Jin

  • 1Department of Engineering and Physics, Macquarie University, North Ryde 2109 NSW, Australia.

Analytical Chemistry
|September 1, 2009
PubMed
Summary
This summary is machine-generated.

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Metal nanostructures enhance fluorescence for improved flow cytometry. Silvered silica beads boost signal intensity, increasing the sensitivity of bioassay systems in analytical laboratories.

Area of Science:

  • Analytical Chemistry
  • Nanotechnology
  • Biotechnology

Background:

  • Metal nanostructures are known to enhance fluorescence.
  • The practical application of this effect in analytical laboratories, particularly for flow cytometry, requires further investigation.

Purpose of the Study:

  • To explore the utility of metal-enhanced fluorescence for flow cytometry.
  • To demonstrate the feasibility of using silvered silica beads for enhanced fluorescence detection in flow cytometry.

Main Methods:

  • Investigated metal-enhanced fluorescence using AlexaFluor 430 IgG immunoassay and AlexaFluor 430 labeling.
  • Utilized nanostructured silver-coated silica beads (400 nm and 5 microm) for flow cytometry detection.
  • Compared fluorescence intensities from silvered beads to control samples.

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Main Results:

  • Observed 8.5-fold and 10.1-fold higher fluorescence intensities at 430 nm excitation for silvered 400 nm and 5 microm beads, respectively.
  • Achieved lower enhancement factors (3.0 and 3.7) in flow cytometry due to excitation wavelength mismatch (488 nm).
  • Demonstrated compatibility of silvered silica beads with flow cytometry readout.

Conclusions:

  • Silvered silica beads effectively intensify fluorescence signals in flow cytometry.
  • This enhancement has the potential to improve the sensitivity of flow cytometry-based bioassay systems.
  • Optimizing plasmon resonance overlap with excitation wavelength is key for maximizing enhancement factors.