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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...

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Fluorescent Lateral Flow Immunoassay Based on Quantum Dots Nanobeads
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Time-resolved luminescent lateral flow assay technology.

Xuedong Song1, Michael Knotts

  • 1Global Science and Technologies, Kimberly Clark Worldwide, 1400 Holcomb Bridge Road, Roswell, GA 30076, USA. Xuedong.Song@kcc.com

Analytica Chimica Acta
|September 16, 2008
PubMed
Summary
This summary is machine-generated.

This study introduces a low-cost detection technology combining time-resolved luminescence with lateral flow assays for sensitive biomarker detection. The developed assay accurately detects C-reactive protein (CRP) in serum, offering broad applications in diagnostics and monitoring.

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Nanotechnology

Background:

  • Lateral flow assays (LFAs) are widely used for rapid diagnostics but often lack sensitivity.
  • Improving the sensitivity of LFAs is crucial for early disease detection and monitoring.
  • Phosphorescent nanoparticles offer unique optical properties for enhanced detection.

Purpose of the Study:

  • To develop a highly sensitive and low-cost detection technology for biomarkers.
  • To integrate time-resolved luminescence with lateral flow assay (LFA) platforms.
  • To create a sensitive assay for C-reactive protein (CRP) detection.

Main Methods:

  • Developed bright, surface-functionalized, mono-dispersed phosphorescent nanoparticles with long lifetimes.
  • Conjugated phosphorescent nanoparticles with monoclonal antibodies for C-reactive protein (CRP).
  • Developed lateral flow immunoassay (LFIA) devices and a cost-effective time-resolved luminescence reader.

Main Results:

  • Achieved a CRP detection sensitivity of <0.2 ng/mL in serum with a linear response from 0.2 to 200 ng/mL.
  • The reader detected <2.5 ng of phosphorescent particles on a nitrocellulose membrane with a wide dynamic range.
  • Demonstrated low background noise and high sensitivity on solid substrates without expensive filters.

Conclusions:

  • The integrated time-resolved luminescence LFA technology offers excellent, low-cost detection performance.
  • This technology enables highly sensitive detection of biomarkers like CRP for clinical diagnostics.
  • Potential applications include diagnostics, warfare agent detection, and environmental monitoring.