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Updated: Jun 19, 2026
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Rapid Nanoprobe Signal Enhancement by In Situ Gold Nanoparticle Synthesis
Published on: March 7, 2018
Microarray-based multiplexed scanometric immunoassay for protein cancer markers using gold nanoparticle probes.
Dongwoo Kim1, Weston L Daniel, Chad A Mirkin
1Department of Chemistry and International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, USA.
Analytical Chemistry
|October 31, 2009
Summary
Electroless gold deposition enhances signals in scanometric immunoassays, enabling sensitive detection of prostate specific antigen and cancer biomarkers. This method offers improved performance over traditional silver development for clinical applications.
Area of Science:
- Analytical Chemistry
- Biotechnology
- Nanotechnology
Background:
- Scanometric immunoassays utilize nanoparticle probes for signal detection.
- Signal enhancement is crucial for improving assay sensitivity and detection limits.
- Traditional silver development methods have limitations in signal amplification.
Purpose of the Study:
- To investigate electroless gold deposition as a signal enhancer in multiplexed scanometric immunoassays.
- To compare gold development with silver development for signal enhancement.
- To assess the assay's sensitivity and selectivity for cancer biomarkers.
Main Methods:
- Utilized gold nanoparticle probes in a microarray-based scanometric immunoassay.
- Employed electroless gold deposition for signal amplification.
- Performed multiple rounds of metal development to optimize signal enhancement.
- Quantified prostate specific antigen (PSA) and other protein cancer markers.
Main Results:
- Electroless gold deposition significantly enhanced the light scattering signal compared to silver development.
- Multiple rounds of gold development further increased signal intensity.
- Achieved detection limits of 300 aM for PSA in buffer and 3 fM in 10% serum.
- Demonstrated selective detection of three cancer biomarkers at low picomolar concentrations.
Conclusions:
- Electroless gold deposition is a superior method for signal enhancement in scanometric immunoassays.
- The developed assay offers high sensitivity and selectivity for cancer biomarker detection.
- This technique holds significant potential for clinical diagnostics and research applications.
