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Amperometric microbial biosensor for p-nitrophenol using Moraxella sp.-modified carbon paste electrode.

Priti Mulchandani1, Carlos M Hangarter, Yu Lei

  • 1Department of Chemical and Environmental Engineering, University of California, Riverside, CA 92521, USA.

Biosensors & Bioelectronics
|August 4, 2005
PubMed
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A novel biosensor using Moraxella sp. bacteria rapidly and sensitively detects p-nitrophenol. This microbial sensor offers a highly specific method for quantifying p-nitrophenol in environmental samples.

Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Biotechnology

Background:

  • p-nitrophenol is a toxic environmental pollutant.
  • Accurate detection of p-nitrophenol is crucial for environmental monitoring.
  • Existing detection methods can be complex or lack sensitivity.

Purpose of the Study:

  • To develop a highly specific, sensitive, and rapid amperometric microbial biosensor for p-nitrophenol determination.
  • To utilize the biodegradation capabilities of Moraxella sp. for p-nitrophenol detection.
  • To establish optimal conditions for biosensor performance.

Main Methods:

  • Development of an amperometric biosensor using a Moraxella sp.-modified carbon paste electrode.
  • Measurement of electrochemical oxidation current of hydroquinone, a p-nitrophenol degradation product.

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  • Optimization of electrode composition, applied potential, and buffer conditions.

    • Main Results:

    • The biosensor demonstrated high specificity against phenol derivatives.
    • A low detection limit of 20 nM (2.78 ppb) p-nitrophenol was achieved.
    • The biosensor exhibited good accuracy, reproducibility, and stability for approximately 3 weeks.
    • Successful application in lake water samples was demonstrated.

    Conclusions:

    • The developed microbial biosensor provides a sensitive, specific, and rapid method for p-nitrophenol quantification.
    • This biosensor is a promising tool for environmental monitoring of p-nitrophenol.
    • The use of Moraxella sp. offers an effective biological recognition element for pollutant detection.