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Labeling DNA Probes

Labeling DNA Probes

DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...

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

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

Published on: June 23, 2016

[Membrane transfer-based colorimetric DNA detection using enzyme modified gold nanoparticles].

Haiyan Li¹, Fengxiang Jing, Qiuyue Gao

¹School of Life Science, East China Normal University, Shanghai 200062, China.

Sheng Wu Gong Cheng Xue Bao = Chinese Journal of Biotechnology

|November 25, 2010

Summary

This summary is machine-generated.

This study introduces a novel DNA detection method using gold nanoparticle probes for signal amplification. The technique offers high sensitivity and simplicity for reliable biosensing applications.

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Area of Science:

Nanotechnology
Biotechnology
Molecular Biology

Context:

Developing sensitive and accessible DNA detection methods is crucial for diagnostics.
Existing methods may require complex equipment or extensive sample preparation.
Gold nanoparticles (AuNPs) offer unique optical properties for signal amplification.

Purpose:

To develop a novel, highly sensitive, and simple membrane transfer-based DNA detection method.
To utilize alkaline phosphatase-labeled gold nanoparticle probes for enhanced signal amplification.
To achieve colorimetric DNA detection without sophisticated instrumentation.

Summary:

A new DNA detection strategy employs alkaline phosphatase-labeled gold nanoparticle probes for signal amplification via membrane transfer.
The method involves a "sandwich" hybridization assay with immobilized capture probes and multi-component AuNP probes.
Colorimetric detection is achieved using a BCIP/NBT kit, with detection limits as low as 1 pmol/L for synthesized DNA and 0.23 pmol/L for Mycobacterium tuberculosis DNA.

Impact:

This method provides a sensitive, simple, and equipment-independent approach for DNA detection.
It holds potential for reliable and accessible biosensing applications, particularly in resource-limited settings.
The use of gold nanoparticles and colorimetric detection enhances the practicality of DNA analysis.