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Related Experiment Videos

Amperometric cytochrome c3-based biosensor for chromate determination.

Caroline Michel1, Fabienne Battaglia-Brunet, Canh Tran Minh

  • 1BRGM, Service Environnement Industriel et Procédés Innovants, Unité Biotechnologies, 3 Avenue Claude Guillemin, BP 6009, 45060 Orleans Cedex 02, France.

Biosensors & Bioelectronics
|November 15, 2003
PubMed
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A novel biosensor using cytochrome c(3) (Cyt c(3)) effectively measures chromate bioavailability. This device offers sensitive and selective detection of hexavalent chromium (Cr(VI)) without interference from common contaminants.

Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Biotechnology

Background:

  • Chromate (CrO(4)(2-)) is a toxic environmental pollutant. Accurate measurement of its bioavailability is crucial for environmental monitoring and remediation.
  • Cytochrome c(3) (Cyt c(3)) possesses chromate reductase activity, making it a potential candidate for biosensor development.
  • Existing biosensor configurations for Cr(VI) detection have limitations in sensitivity, stability, or interference.

Purpose of the Study:

  • To develop and optimize an amperometric biosensor for measuring chromate bioavailability.
  • To evaluate different enzyme immobilization techniques for cytochrome c(3) on glassy carbon electrodes.
  • To determine the analytical performance of the optimized biosensor for hexavalent chromium (Cr(VI)) detection.

Main Methods:

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  • Isolation of cytochrome c(3) from Desulfomicrobium norvegicum.
  • Development of amperometric biosensors using various immobilization methods: entrapment in poly 3,4-ethylenedioxythiophene, adsorption, and dialysis membranes.
  • Testing biosensor performance for qualitative and quantitative determination of Cr(VI).
  • Assessing interference from other metal ions like As(V), As(III), and Fe(III).

Main Results:

  • Enzyme immobilization via entrapment in poly 3,4-ethylenedioxythiophene denatured cytochrome c(3).
  • Adsorption technique preserved enzyme activity but resulted in a limited detection range.
  • Dialysis membrane immobilization yielded the best results, enabling Cr(VI) determination from 0.20 to 6.84 mg l(-1) with high sensitivity.
  • The developed biosensor showed no interference from As(V), As(III), and Fe(III).

Conclusions:

  • An amperometric biosensor utilizing cytochrome c(3) immobilized with dialysis membranes is effective for Cr(VI) detection.
  • The biosensor offers a sensitive, selective, and robust method for measuring chromate bioavailability.
  • This approach requires minimal enzyme quantities and shows promise for environmental monitoring applications.