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Optimising Electrical Interfacing between the Trimeric Copper Nitrite Reductase and Carbon Nanotubes.

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Summary

Copper-containing nitrite reductase (NiR) from Alcaligenes faecalis was immobilized on functionalized multi-walled carbon nanotubes (MWCNTs). This bioelectrochemical system achieved high nitrite reduction current density, demonstrating efficient enzyme-electrode interaction.

Keywords:
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Area of Science:

  • Biocatalysis
  • Electrochemistry
  • Nanomaterials Science

Background:

  • Nitrite reductase (NiR) is crucial for nitrogen cycling and denitrification.
  • Efficient immobilization of enzymes on electrode surfaces is key for biosensor development.
  • Multi-walled carbon nanotubes (MWCNTs) offer excellent surface area and conductivity for enzyme immobilization.

Purpose of the Study:

  • To immobilize copper-containing nitrite reductase (NiR) from Alcaligenes faecalis onto functionalized MWCNT electrodes.
  • To investigate the immobilization mechanism and its impact on enzyme electrocatalytic activity.
  • To achieve high-performance bioelectrocatalytic reduction of nitrite.

Main Methods:

  • Functionalization of MWCNTs with adamantyl groups to promote hydrophobic interactions.
  • Immobilization of NiR onto functionalized MWCNT electrodes.
  • Direct electrochemistry to assess nitrite reduction activity and current density.
  • Analysis of enzyme subunit behavior and electron-tunneling distance.

Main Results:

  • Successful immobilization of NiR on functionalized MWCNTs, primarily via hydrophobic interactions.
  • Achieved a high bioelectrocatalytic reduction current density of 1.41 mA cm⁻² at NiR's redox potential.
  • Demonstrated that enzyme desymmetrization upon immobilization leads to independent electrocatalytic behavior of subunits.
  • Corroborated findings with electron-tunneling distance dependence studies.

Conclusions:

  • Functionalized MWCNTs provide an effective platform for NiR immobilization, enhancing bioelectrocatalytic performance.
  • Hydrophobic interactions play a significant role in the enzyme-electrode complex formation.
  • The desymmetrization of NiR trimers on MWCNTs unlocks enhanced and independent electrocatalytic activity of individual subunits.