A sensitive biosensor for lactate based on layer-by-layer assembling MnO2 nanoparticles and lactate oxidase on...

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Biosensors

Background:

• Lactate is a crucial biomarker in various physiological and pathological conditions.
• Existing lactate detection methods often face limitations in sensitivity, selectivity, or cost-effectiveness.
• Enzyme-based biosensors offer a promising approach for accurate lactate monitoring.

Purpose of the Study:

• To develop a highly sensitive enzyme-based biosensor for lactate detection.
• To utilize manganese dioxide (MnO2) nanoparticles to enhance biosensor performance.
• To employ a layer-by-layer (LBL) assembly technique for fabricating the biosensor.

Main Methods:

• Fabrication of a field-effect transistor (FET) biosensor.
• Modification of the FET gate surface with MnO2 nanoparticles using LBL assembly.
• Immobilization of lactate oxidase enzyme onto the MnO2-modified gate.
• Electrochemical characterization and performance evaluation of the biosensor.

Main Results:

• Successful integration of MnO2 nanoparticles onto the FET gate surface.
• Demonstration of enhanced sensitivity in lactate detection compared to unmodified sensors.
• The enzyme-based FET biosensor exhibited a sensitive response to varying lactate concentrations.
• The LBL method provided a stable and effective platform for enzyme immobilization.

Conclusions:

• The developed MnO2 nanoparticle-enhanced enzyme-based FET biosensor is a sensitive platform for lactate detection.
• Layer-by-layer assembly is an effective strategy for creating advanced biosensor interfaces.
• This biosensor holds potential for applications in clinical diagnostics and biochemical analysis.