Modified electrodes with synthetic biocatalytic membranes

Area of Science:

• Electrochemistry
• Biomaterials Science
• Enzyme Immobilization

Background:

• Biocatalytic membranes offer unique platforms for electrochemical sensing.
• Immobilizing enzymes on electrode surfaces is crucial for developing stable and reusable biosensors.
• Electropolymerization provides a versatile method for creating functionalized electrode surfaces.

Purpose of the Study:

• To prepare a novel biocatalytic membrane by immobilizing glucose oxidase (GOx) onto electrode surfaces.
• To characterize the electrochemical and biocatalytic properties of the synthesized membrane.
• To investigate the potential of these modified electrodes as bioelectrochemical sensors.

Main Methods:

• Oxidative electropolymerization of 8-hydroxyquinaldine (8-OHQ) monomers in the presence of glucose oxidase (GOx).
• Modification of glassy carbon (GC), gold (Au), and platinum (Pt) rotating disk electrodes.
• Characterization of enzyme activity and electrochemical signals from the modified electrodes.

Main Results:

• A stable biocatalytic membrane was successfully prepared on GC, Au, and Pt electrodes.
• Signals from GC electrodes were primarily due to immobilized GOx, indicating successful enzyme integration.
• Au and Pt electrodes showed combined signals from the enzyme and the electrode material, suggesting surface interactions.

Conclusions:

• The developed biocatalytic membrane demonstrates effective immobilization of glucose oxidase.
• The modified electrodes exhibit potential for application as sensitive bioelectrochemical sensors.
• Further research can explore optimizing these membranes for specific analyte detection.