Glucose oxidase multilayer modified microcantilevers for glucose measurement

Area of Science:

• Biomedical Engineering
• Biosensors
• Nanotechnology

Background:

• Microcantilever sensors offer high sensitivity for detecting biomolecules.
• Enzyme functionalization is a key strategy for creating specific biosensing platforms.
• Accurate glucose detection is crucial for diabetes management.

Purpose of the Study:

• To develop and characterize a novel enzyme-based microcantilever sensor for glucose detection.
• To investigate the sensing mechanism and specificity of the glucose oxidase functionalized microcantilever.
• To evaluate the influence of flow rate on sensor performance.

Main Methods:

• Layer-by-layer nanoassembly was used to modify microcantilevers with glucose oxidase (GOx).
• Microcantilever bending was measured in response to varying glucose concentrations.
• Specificity was tested against other sugars (mannose, fructose, galactose).
• Kinetic and thermodynamic analyses were performed to elucidate the bending mechanism.

Main Results:

• The microcantilever exhibited bending proportional to glucose concentration.
• The sensor demonstrated high specificity for glucose over other tested sugars.
• Flow rate effects on the cantilever response were analyzed.
• Conformational changes in GOx and gluconic acid formation were identified as the cause of deflection.

Conclusions:

• The developed GOx-functionalized microcantilever sensor is a sensitive and specific platform for glucose detection.
• The sensor's response mechanism is linked to enzyme conformational changes and product formation.
• This technology holds promise for developing advanced glucose monitoring devices.