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Microbial Biosensors

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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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Hollow Microneedle-based Sensor for Multiplexed Transdermal Electrochemical Sensing

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Highly sensitive lactate biosensor by engineering chitosan/PVI-Os/CNT/LOD network nanocomposite.

Xiaoqiang Cui¹, Chang Ming Li, Jianfeng Zang

¹School of Chemical and Biomedical Engineering, Nanyang Technological University, 70 Nanyang Dr, Singapore 637457, Singapore.

Biosensors & Bioelectronics

|April 6, 2007

Summary

A novel network nanocomposite enhances lactate detection. Carbon nanotubes improve conductivity and stability, leading to a highly sensitive and reliable lactate biosensor for various applications.

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Bridging the Bio-Electronic Interface with Biofabrication

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Published on: June 6, 2012

Area of Science:

Electrochemistry
Materials Science
Biotechnology

Background:

Lactate detection is crucial in diagnostics, life science, and food analysis.
Developing sensitive and stable biosensors for lactate remains a challenge.
Nanomaterials offer unique properties for biosensor enhancement.

Purpose of the Study:

To construct a novel chitosan/polyvinylimidazole-Os/carbon nanotube/lactate oxidase network nanocomposite on a gold electrode.
To develop a superior lactate biosensor with enhanced conductivity, stability, and electroactivity.
To investigate the role of carbon nanotubes in the nanocomposite structure and performance.

Main Methods:

Fabrication of a network nanocomposite using chitosan, polyvinylimidazole-Os (PVI-Os), carbon nanotubes (CNTs), and lactate oxidase (LOD) on a gold electrode.
Utilizing FESEM and electrochemical characterization to analyze the nanocomposite structure and properties.
Optimizing the composition ratio and conditions for lactate detection.

Main Results:

CNTs acted as a cross-linker, forming a network nanostructure that improved conductivity, stability, and electroactivity.
The standard deviation of the sensor was reduced from 19.6% to 4.9% with the addition of CNTs.
The optimized lactate sensor achieved a sensitivity of 19.7 µA mM⁻¹cm⁻² and a detection limit of 5 µM, significantly outperforming existing sensors.

Conclusions:

The developed network nanocomposite provides a highly sensitive and stable platform for lactate detection.
The nanoengineering approach using matched components and network nanostructures is effective for biosensor development.
This strategy has broad potential applications in diagnostics, life science, and food analysis.