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DNA Microarrays

DNA Microarrays

Microarrays are high-throughput and relatively inexpensive assays that can be automated to analyze large quantities of data at a time. They are used in genome-wide studies to compare gene or protein expression under two varied conditions, such as healthy and diseased states. Microarrays consist of glass or silica slides on which probe molecules are covalently attached through surface functionalization. Most commonly, the slides are prepared through the chemisorption of silanes to silica...

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Updated: Jun 7, 2026

The Visual Colorimetric Detection of Multi-nucleotide Polymorphisms on a Pneumatic Droplet Manipulation Platform

The Visual Colorimetric Detection of Multi-nucleotide Polymorphisms on a Pneumatic Droplet Manipulation Platform

Published on: September 27, 2016

Gold nanoparticle-assisted single base-pair mismatch discrimination on a microfluidic microarray device.

Lin Wang¹, Paul C H Li

¹Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada.

Biomicrofluidics

|November 4, 2010

Summary

This summary is machine-generated.

Gold nanoparticles (GNPs) enable simple, rapid DNA analysis on microfluidic chips. These methods improve DNA hybridization and allow differentiation of closely related pathogens with high sensitivity.

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Last Updated: Jun 7, 2026

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A Droplet-Based Microfluidic Approach and Microsphere-PCR Amplification for Single-Stranded DNA Amplicons

Published on: November 14, 2018

Area of Science:

Nanotechnology
Molecular Biology
Analytical Chemistry

Background:

Gold nanoparticles (GNPs) offer unique optical and electronic properties for biosensing applications.
Microfluidic devices provide miniaturized platforms for high-throughput biological analysis.
Efficient DNA hybridization is crucial for accurate molecular diagnostics.

Purpose of the Study:

To develop and present two novel gold nanoparticle-based DNA analysis methods.
To enhance DNA hybridization efficiency using GNP-mediated nanoscale probe spacing.
To demonstrate sensitive and room-temperature DNA discrimination using microfluidics and GNPs.

Main Methods:

Immobilization of probe DNA on GNP surfaces within a microfluidic device for enhanced hybridization.
Binding of target DNA (oligonucleotides or PCR amplicons) to GNPs followed by hybridization to immobilized probes.
Utilizing microfluidic chips for low-volume DNA analysis and room-temperature discrimination.

Main Results:

Improved hybridization efficiency of target oligonucleotides due to nanoscale spacing on GNPs.
Successful discrimination between two PCR amplicons from closely related fungal pathogens (Botrytis cinerea and Botrytis squamosa) differing by a single base pair.
Demonstrated high sensitivity, requiring only 8 fmol of oligonucleotides or 3 ng of PCR products.

Conclusions:

The presented GNP-based microfluidic methods offer a simple, rapid, and sensitive approach for DNA analysis.
These methods facilitate efficient DNA hybridization and accurate discrimination of genetic variations at room temperature.
The technology avoids the need for high-temperature stringency, simplifying experimental procedures and reducing costs.