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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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Serum cytochrome c detection using a cytochrome c oxidase biosensor.

Damian Ashe1, Trevor Alleyne, Emmanuel Iwuoha

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A novel biosensor using immobilized cytochrome c oxidase detects circulating cytochrome c, a key indicator of myocardial infarctions (MIs). This advancement offers a potential diagnostic tool for MIs and programmed cell death studies.

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Area of Science:

  • Biomedical Engineering
  • Electrochemistry
  • Biochemistry

Background:

  • Cytochrome c release is critical in programmed cell death and elevated in myocardial infarctions (MIs).
  • Accurate detection of circulating cytochrome c is essential for diagnosing MIs.

Purpose of the Study:

  • To develop and characterize a novel biosensor for detecting cytochrome c.
  • To evaluate the biosensor's potential as a diagnostic tool for MIs.

Main Methods:

  • Immobilization of bovine cytochrome c oxidase in a didodecyldimethylammonium bromide vesicular system onto gold electrodes.
  • Square-wave-voltammetric analysis to study the interaction with cytochrome c.
  • Kinetic analysis using electrochemical Michaelis-Menten model.

Main Results:

  • The biosensor exhibited sensitivity to cytochrome c in buffer and human serum.
  • Electrochemical Michaelis-Menten kinetics revealed a K(m) of 1.57 microM and I(max) of 1.38 x 10(-6) muA.
  • A detection limit of 0.2 microM in human serum was achieved, below the physiological concentration for MIs.

Conclusions:

  • The developed cytochrome c oxidase biosensor is effective for detecting cytochrome c.
  • This biosensor shows significant potential as a diagnostic tool for myocardial infarctions and programmed cell death research.