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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: May 21, 2026

A Microfluidic-based Electrochemical Biochip for Label-free DNA Hybridization Analysis

A Microfluidic-based Electrochemical Biochip for Label-free DNA Hybridization Analysis

Published on: September 10, 2014

A microfluidic-based electrochemical biochip for label-free diffusion-restricted DNA hybridization analysis.

Hadar Ben-Yoav¹, Peter H Dykstra, William E Bentley

¹MEMS Sensors and Actuators Laboratory (MSAL), Department of Electrical and Computer Engineering, Institute for Systems Research, University of Maryland, College Park, MD 20742, USA. benyoav@umd.edu

Biosensors & Bioelectronics

|June 2, 2012

Summary

This study presents a new microfluidic biosensor for DNA detection. The novel approach improves sensitivity and detection limits in miniaturized devices using a diffusion-restriction model.

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A Microfluidic-based Electrochemical Biochip for Label-free DNA Hybridization Analysis

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Dry Film Photoresist-based Electrochemical Microfluidic Biosensor Platform: Device Fabrication, On-chip Assay Preparation, and System Operation

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Published on: September 19, 2017

Area of Science:

Biotechnology
Nanotechnology
Analytical Chemistry

Background:

Microfluidic devices offer reduced sample volumes and processing times for DNA hybridization detection.
Miniaturization in biosensors decreases signal-to-noise ratio and compromises sensitivity.
Understanding micro-scale phenomena is crucial for advancing biosensor performance.

Purpose of the Study:

To develop and characterize a miniaturized biochip nanovolume reactor for accurate DNA hybridization detection.
To investigate the role of charge transfer and diffusional resistance in electrochemical impedance spectroscopy (EIS) at micro-scales.
To enhance the sensitivity and selectivity of microfluidic biosensors.

Main Methods:

Application of a diffusion-restriction model to a miniaturized biochip nanovolume reactor.
Utilizing electrochemical impedance spectroscopy (EIS) to analyze DNA hybridization events.
Developing a highly functional microfluidic biosensor for single-stranded DNA (ssDNA) detection.

Main Results:

Accurate characterization of DNA hybridization events contributing to resistance shifts.
Demonstrated significant role of diffusional and charge transfer resistance in EIS analyses at micro-scales.
Achieved a calculated detection limit of 3.8 nM for ssDNA targets with 13% cross-reactivity after 20 min incubation.

Conclusions:

The developed microfluidic biosensor enables selective ssDNA detection with improved sensitivity.
The diffusion-restriction model accurately characterizes hybridization in miniaturized devices.
This approach provides a foundation for improving biosensor performance by elucidating diffusion behavior.