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Multiplex Detection of Bacteria in Complex Clinical and Environmental Samples using Oligonucleotide-coupled Fluorescent Microspheres
Published on: October 23, 2011
Quantitative multiplex detection of pathogen biomarkers on multichannel waveguides
Harshini Mukundan1, Hongzhi Xie, Dominique Price
1Physical Chemistry and Applied Spectroscopy, Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Analytical Chemistry
|December 17, 2009
Summary
This study presents a novel waveguide biosensor for detecting Bacillus anthracis toxins. The multiplex assay offers sensitive, rapid, and reproducible detection of protective antigen and lethal factor in serum.
Area of Science:
- Biotechnology
- Biosensor Technology
- Medical Diagnostics
Background:
- Accurate disease prediction requires sensitive detection of multiple biomarkers.
- Conventional immunoassays face limitations in sensitivity, reproducibility, and throughput.
- Bacillus anthracis lethal toxin detection is crucial for biodefense.
Purpose of the Study:
- To develop a multiplex biomarker assay for Bacillus anthracis protective antigen and lethal factor.
- To utilize semiconductor quantum dots and a waveguide-based biosensor platform for enhanced detection.
- To improve upon conventional immunoassay capabilities for speed, sensitivity, and multiplexing.
Main Methods:
- Developed a waveguide-based biosensor platform using semiconductor quantum dots as fluorescence reporters.
- Designed and fabricated multichannel waveguides for simultaneous multiplex detection.
- Quantified protective antigen and lethal factor in complex biological samples like serum.
Main Results:
- Achieved sensitive (1 pM limit of detection) and specific detection of biomarkers.
- Demonstrated rapid assay performance with results in 15 minutes.
- Multichannel waveguides enabled simultaneous, reproducible detection in three samples with high concordance to single-channel data.
Conclusions:
- The developed waveguide biosensor platform offers a superior alternative to conventional immunoassays for biomarker detection.
- The multichannel waveguide design enhances sample throughput and measurement reproducibility.
- This technology facilitates rapid, sensitive, and multiplexed detection of critical biomarkers in complex samples.
