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Related Experiment Videos

An amperometric enzyme-linked immunosensor for Nitrobacter

B Sandén1, L H Eng, G Dalhammar

  • 1Department of Biotechnology, Royal Institute of Technology (KTH), Stockholm, Sweden. bjorn@biochem.kth.se

Applied Microbiology and Biotechnology
|January 19, 1999
PubMed
Summary

A novel amperometric enzyme-linked immunoassay enables specific enumeration of Nitrobacter bacteria. This sensitive immunosensor offers a faster, compatible alternative for quantifying Nitrobacter populations.

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Area of Science:

  • Environmental microbiology
  • Biosensor technology
  • Analytical chemistry

Background:

  • Accurate enumeration of Nitrobacter is crucial for understanding nitrogen cycling in various environments.
  • Existing methods for Nitrobacter detection can be time-consuming or lack specificity.
  • Development of rapid and sensitive detection methods is needed for environmental monitoring.

Purpose of the Study:

  • To develop a new amperometric enzyme-linked immunoassay for specific enumeration of Nitrobacter.
  • To optimize sensor performance by studying various parameters.
  • To compare the developed immunosensor with existing methods for validation.

Main Methods:

  • Utilized a glassy carbon electrode for carrying out the immunological reaction.

Related Experiment Videos

  • Employed a competitive immunoassay principle with monoclonal primary and alkaline-phosphatase-labelled secondary antibodies.
  • Amperometric detection of an electroactive product generated from the enzyme substrate 5-bromo-4-chloro-3-indolyl phosphate.

    • Main Results:

    • Achieved a detection limit of approximately 3 x 10^6 Nitrobacter cells/ml.
    • Demonstrated compatible quantitative detection results when compared to a previously developed enzyme-linked immunosorbent assay (ELISA).
    • Showed that the overall assay time can be significantly shortened using the new sensor.

    Conclusions:

    • The developed amperometric enzyme-linked immunoassay provides a sensitive and specific method for Nitrobacter enumeration.
    • This immunosensor offers a faster and efficient alternative to traditional methods.
    • The technology holds promise for improved environmental monitoring and microbial analysis.