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Related Experiment Videos

Bacterium-based NO2- biosensor for environmental applications.

Michael Nielsen1, Lars Hauer Larsen, Mike S M Jetten

  • 1Department of Microbiology, University of Aarhus, Aarhus, Denmark. mnielsen@biology.au.dk

Applied and Environmental Microbiology
|November 6, 2004
PubMed
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A novel biosensor detects nitrite (NO2-) by measuring nitrous oxide (N2O) produced by specific bacteria. This sensitive and selective nitrite biosensor is effective for monitoring various water bodies and wastewater.

Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Microbiology

Background:

  • Nitrite (NO2-) is a key analyte in environmental and wastewater monitoring.
  • Accurate and sensitive detection methods for nitrite are crucial for assessing water quality.
  • Existing nitrite detection methods may have limitations in sensitivity, selectivity, or real-time monitoring capabilities.

Purpose of the Study:

  • To develop a sensitive and selective biosensor for nitrite (NO2-) detection.
  • To evaluate denitrifying bacteria for their suitability in a nitrite biosensor.
  • To assess the performance and applicability of the developed biosensor in various aquatic environments.

Main Methods:

  • Development of a biosensor based on bacterial reduction of nitrite (NO2-) to nitrous oxide (N2O).

Related Experiment Videos

  • Utilized an electrochemical N2O sensor for detection.
  • Screened and characterized four denitrifying organisms, focusing on Stenotrophomonas nitritireducens and Alcaligenes faecalis.
  • Assessed physiological aspects including growth rate, NO2- tolerance, and environmental factor effects.

    • Main Results:

    • Two bacterial strains, Stenotrophomonas nitritireducens and Alcaligenes faecalis, were successfully employed.
    • The biosensor demonstrated a linear response to NO2- up to 1-2 mM with a detection limit of ~1 µM.
    • High specificity for NO2- was observed, with minimal interference from other compounds.
    • The biosensor was effective for long-term online monitoring in wastewater and profiling marine sediment.

    Conclusions:

    • A robust and sensitive NO2- biosensor was successfully developed using specific denitrifying bacteria.
    • The biosensor offers a reliable method for real-time nitrite monitoring in diverse aquatic systems.
    • The developed technology has significant potential for environmental monitoring and water quality assessment.