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Design and Development of Aptamer–Gold Nanoparticle Based Colorimetric Assays for In-the-field Applications

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Published on: June 23, 2016

Aptamer-based silver nanosensor for multiple protein detection.

Ying Wang¹, Danke Xu, Hong-Yuan Chen

¹State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China.

|July 7, 2012

Summary

This summary is machine-generated.

This study introduces a novel aptamer-based silver nanosensor for simultaneous detection of multiple proteins. The developed sensor demonstrates high sensitivity and rapidity for protein analysis, offering a promising tool for diagnostics.

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Area of Science:

Biotechnology
Nanotechnology
Analytical Chemistry

Background:

Protein detection is crucial in diagnostics.
Existing methods can be time-consuming or lack sensitivity.
Aptamer-based nanosensors offer a promising alternative.

Purpose of the Study:

To design and validate a novel aptamer-based silver nanosensor.
To achieve simultaneous detection of multiple proteins.
To demonstrate high sensitivity and throughput for protein analysis.

Main Methods:

Immobilization of single-stranded DNA (ssDNA) modified silver nanoparticles (AgNPs) on glass slides.
Hybridization of dye-labeled aptamers with complementary strands on AgNPs.
Detection of target proteins via aptamer-protein complex formation and subsequent fluorescence signal changes.

Main Results:

The nanosensor exhibited high sensitivity for protein detection, with a limit of detection of 0.4 fmol for thrombin.
Demonstrated simultaneous detection of multiple proteins (IgE and thrombin) using multicolor silver nanoprobes.
Achieved a linear response range from 0.8 fmol to 0.5 pmol for thrombin detection.

Conclusions:

The developed silver nanosensor provides a sensitive, rapid, and high-throughput method for protein detection.
This heterogeneous approach enables simultaneous and individual recognition of multiple proteins.
The nanosensor holds potential for miniaturized diagnostic applications.