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Microbial Biosensors

Microbial Biosensors

Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...

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Related Experiment Video

Updated: Jun 24, 2026

Microfluidic On-chip Capture-cycloaddition Reaction to Reversibly Immobilize Small Molecules or Multi-component Structures for Biosensor Applications

Microfluidic On-chip Capture-cycloaddition Reaction to Reversibly Immobilize Small Molecules or Multi-component Structures for Biosensor Applications

Published on: September 23, 2013

Bioconjugation techniques for microfluidic biosensors.

Julie M Goddard¹, David Erickson

¹Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY 14853, USA. jmg26@cornell.edu

Analytical and Bioanalytical Chemistry

|March 13, 2009

Summary

This summary is machine-generated.

We compared DNA immobilization methods for biosensors. Aminosilane with glutaraldehyde offered the best density and stability, while dendrimers improved hybridization efficiency for microfluidic applications.

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

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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

Area of Science:

Biotechnology
Materials Science
Surface Chemistry

Background:

Surface biofunctionalization is critical for microfluidic biosensors.
Optimizing DNA immobilization impacts sensor performance and stability.

Purpose of the Study:

To evaluate five bioconjugation chemistries for DNA immobilization on silicon substrates.
To compare these methods based on immobilization/hybridization density and stability.

Main Methods:

Evaluated organosilanes, carbonyldiimidazole (CDI) activation, and dendrimers for DNA conjugation.
Assessed immobilization density, hybridization efficiency, shear stress stability, and storage stability.

Main Results:

Dendrimer tethers yielded the highest hybridization efficiency.
Aminosilane with glutaraldehyde provided superior immobilization/hybridization densities and enhanced stability.
CDI activation offered a novel strategy with sufficient performance.

Conclusions:

Aminosilane-glutaraldehyde conjugation is optimal for robust DNA immobilization in microfluidic biosensors.
The findings are relevant for nanobiotechnology applications requiring surface biofunctionalization.