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Related Concept Videos

Microbial Biosensors01:17

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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A Disposable Dopamine Sensor Based on Oxidized Cellulose Nanofibril-Modified SPCE.

Feriel Boussema1, Sondes Bourigua1, Zayneb Jebali1

  • 1Laboratory of Interfaces and Advanced Materials, Faculty of Sciences, University of Monastir, Monastir 5000, Tunisia.

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Researchers developed a new sensor using cellulose nanofibrils to detect dopamine, a key neurotransmitter. This sensitive and stable biosensor accurately measures dopamine levels in biological fluids like urine.

Keywords:
TEMPO-oxidized cellulose nanofibrilsTOCNF-modified SPCEdopamineelectrochemical detection

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Area of Science:

  • Biomedical Engineering
  • Electrochemistry
  • Materials Science

Background:

  • Dopamine is a crucial neurotransmitter in the central nervous system.
  • Imbalances in dopamine are linked to neurological disorders and depression.
  • Accurate measurement of dopamine in biological fluids is essential for diagnostics.

Purpose of the Study:

  • To develop a sensitive and reliable sensor for dopamine detection.
  • To utilize TEMPO-oxidized cellulose nanofibrils (TOCNFs) for electrochemical sensing applications.
  • To validate the sensor's performance in biological samples.

Main Methods:

  • Modification of disposable screen-printed carbon electrodes (SPCEs) with TOCNFs derived from marram grass.
  • Electrochemical detection of dopamine using differential pulse voltammetry (DPV).
  • Analysis of sensor performance including sensitivity, detection limit, repeatability, reproducibility, and stability.

Main Results:

  • The TOCNF-modified SPCE achieved a sensitivity of 7.92 µA/µM and a detection limit of 10 nM.
  • The sensor demonstrated excellent repeatability (RSD = 1.9%) and reproducibility (RSD = 2.3%).
  • The sensor maintained 91% of its initial response after 3 weeks and showed satisfactory recovery in human urine samples.

Conclusions:

  • The developed TOCNF-modified SPCE is a promising platform for sensitive and stable electrochemical detection of dopamine.
  • This sensor offers a viable tool for monitoring dopamine levels in biological fluids.
  • The use of plant-derived cellulose nanofibrils presents a sustainable approach for biosensor development.