Glucose biosensor based on carbon nanotube epoxy composites.

Area of Science:

• Biomaterials Science
• Electrochemistry
• Biosensor Technology

Background:

• Development of efficient biosensors for glucose detection is crucial for diagnostics.
• Carbon nanotube (CNT) composites offer unique electrochemical properties for biosensor applications.
• Existing glucose biosensors often require higher detection potentials, impacting performance.

Purpose of the Study:

• To report a novel glucose biosensor utilizing a rigid and renewable carbon nanotube (CNT) based biocomposite.
• To immobilize glucose oxidase (GOx) within a CNT epoxy-composite matrix.
• To evaluate the electrochemical performance and compare it with existing graphite-based biosensors.

Main Methods:

• Fabrication of a CNT epoxy-composite matrix by dispersing multi-wall CNTs in epoxy resin.
• Immobilization of glucose oxidase (GOx) enzyme within the CNT epoxy-composite.
• Electrochemical characterization of the fabricated glucose biosensor (GOx-CNTEC).
• Comparison of performance with a glucose oxidase-graphite epoxy composite biosensor (GOx-GEC).

Main Results:

• The CNT epoxy composite biosensor (GOx-CNTEC) demonstrated excellent sensitivity and stable electrochemical properties.
• Faster electron transfer rates were observed due to CNTs' conductive nature and improved enzyme incorporation.
• Significantly lower detection potential (+0.55 V) was achieved compared to GOx-GEC (+0.90 V).

Conclusions:

• The novel GOx-CNTEC biosensor offers superior performance characteristics compared to traditional graphite-based counterparts.
• The use of CNTs in epoxy composites provides a promising platform for developing advanced glucose biosensors.
• This CNT-based biosensor exhibits enhanced sensitivity, stability, and a lower operating potential, making it suitable for practical applications.