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Microbial Biosensors01:17

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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Disposable Microfluidic Sensor Based on Nanocellulose for Glucose Detection.

Khan Mohammad Ahsan Uddin1, Ville Jokinen2, Farzin Jahangiri2

  • 1BioMediTech Institute and Faculty of Biomedical Sciences and Engineering Tampere University of Technology (TUT) Post address: P.O. Box 692 FI-33101 Tampere Finland.

Global Challenges (Hoboken, NJ)
|October 1, 2019
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Summary

This study introduces nanocellulose for eco-friendly, disposable biosensors. These point-of-care devices efficiently detect glucose in under 10 minutes, enabling scalable multianalyte diagnostics.

Keywords:
biosensorscolorimetrydiagnosticsglucose oxidasenanofibrils

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Analytical Chemistry

Background:

  • Point-of-care (POC) diagnostic devices are increasingly vital for biosensing and biodiagnostics.
  • There is a growing demand for inexpensive, disposable, and environmentally sustainable diagnostic tools.
  • Microfluidics offers portability and reduced reagent consumption, making it suitable for POC applications.

Purpose of the Study:

  • To develop a novel point-of-care diagnostic unit using nanocellulose.
  • To evaluate the performance of nanocellulose in microfluidic channels for enzyme immobilization.
  • To demonstrate the capability of detecting glucose at low concentrations rapidly.

Main Methods:

  • Nanocellulose was utilized to fabricate microfluidic channels.
  • Nanocellulose served as a matrix for the storage and immobilization of glucose oxidase.
  • The diagnostic unit's performance was tested for glucose detection in fluid matrices.

Main Results:

  • The nanocellulose-based microfluidic device demonstrated improved retention of enzymatic activity.
  • The disposable diagnostic unit successfully detected glucose at concentrations as low as 0.1 × 10-3 m.
  • Detection of glucose was achieved in less than 10 minutes.

Conclusions:

  • Nanocellulose is a viable material for creating portable, disposable, and eco-friendly biosensing devices.
  • The developed technology enables efficient glucose detection with high sensitivity and speed.
  • Nanocellulose's patterning and fluidic capabilities support the development of scalable multianalyte diagnostic systems.