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Recombinant laccase: II. Medical biosensor.

Nicola Luigi Bragazzi1, Eugenia Pechkova, Dora Scudieri

  • 1Biophysics and Nanobiotechnology Laboratories, Department of Experimental Medicine, University of Genova, Genoa 16121-16167, Italy.

Critical Reviews in Eukaryotic Gene Expression
|November 13, 2012
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Summary

This study developed a sensitive enzyme biosensor using Langmuir-Blodgett technology for detecting clomipramine, a common antidepressant. The biosensor demonstrated excellent stability and rapid response times for medical applications.

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Area of Science:

  • Biotechnology
  • Biosensor Technology
  • Enzyme Kinetics

Background:

  • Langmuir-Blodgett (LB) technology enables precise thin-film fabrication for biosensor development.
  • Recombinant fungal laccase from Rigidoporous lignosus is a suitable enzyme for catalyzing clomipramine.
  • Accurate detection of antidepressants like clomipramine is crucial for medical diagnostics.

Purpose of the Study:

  • To develop a high-sensitivity enzyme-based biosensor for clomipramine detection using LB technology.
  • To characterize the topological and stability properties of the laccase thin film.
  • To investigate the enzyme kinetics and performance of the developed biosensor.

Main Methods:

  • Fabrication of a laccase thin film using Langmuir-Blodgett (LB) technology.
  • Characterization of thin-film topological properties using LB π-A isotherm and Atomic Force Microscopy (AFM).
  • Sensitivity assessment via UV spectroscopy; enzyme kinetics and performance evaluation using potentiometric and amperometric measurements.

Main Results:

  • LB film exhibited a mean roughness of 8.22 nm and compressibility coefficient of 37.5 m/N.
  • Biosensor showed linear response up to 20 µM clomipramine with a detectable absorbance peak shift at 400 nm.
  • Enzyme kinetics revealed electron transfer, with key parameters including K(M) of 4.1 µM and K(cat)/K(M) of 2.8 × 10(7) mol(-1) s(-1).
  • High sensitivity (440 nA/µM), rapid response (<5 s), and confirmed stability over one month.

Conclusions:

  • The LB technology successfully created a stable, high-sensitivity enzyme biosensor for clomipramine.
  • The developed biosensor offers a promising tool for rapid and accurate antidepressant monitoring in medical settings.
  • The characterized enzyme kinetics provide valuable insights for further biosensor optimization.