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Glucose oxidase mediation by soluble and immobilized electroactive detergents
S M Zakeeruddin1, M Grätzel, D M Fraser
1Département de chimie, Ecole Polytechnique Fédérale de Lausanne, Switzerland.
Biosensors & Bioelectronics
|January 1, 1996
Summary
Novel osmium-based mediators were developed for glucose oxidase (GOD). These surface-active complexes enable reagentless glucose sensors, with functional groups influencing mediator performance and enzyme interaction.
Area of Science:
- Electrochemistry
- Biochemistry
- Materials Science
Background:
- Development of efficient electron transfer mediators is crucial for biosensor technology.
- Osmium-based complexes offer tunable redox properties for mediating enzyme activity.
- Surface-active mediators can improve enzyme stability and sensor performance.
Purpose of the Study:
- Synthesize and characterize novel surface-active, inorganometallic osmium complexes.
- Evaluate their efficacy as electron transfer mediators for glucose oxidase (GOD).
- Investigate the impact of mediator structure on GOD interaction and sensor performance.
Main Methods:
- Synthesis of osmium-dipyridylamine complexes with varying alkyl chain terminations.
- Electrochemical characterization of mediators and their interaction with GOD.
- Immobilization of mediators and GOD onto graphite electrodes for biosensor fabrication.
- Characterization of reagentless glucose-sensitive electrodes.
Main Results:
- Osmium complexes demonstrated varying interactions with GOD, influenced by omega-functional groups.
- Omega-functional groups reduced mediator micelle formation and protein denaturation.
- Ionized carboxyl groups slowed mediation compared to methyl-terminated chains.
- Covalent coupling of carboxyl-functionalized mediators to electrodes was successful.
- Immobilized mediators effectively mediated GOD activity, and self-mediating enzymes were created.
Conclusions:
- Novel surface-active osmium complexes serve as effective electron transfer mediators for GOD.
- Mediator functionalization allows for tailored enzyme interactions and electrode immobilization.
- These findings pave the way for advanced reagentless glucose biosensors.
