Microgravimetric lectin biosensor based on signal amplification using carbohydrate-stabilized gold nanoparticles

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Analytical Chemistry

Background:

• Biosensors are crucial for detecting specific biomolecules.
• Gold nanoparticles (Au NPs) offer unique optical and electronic properties for signal amplification.
• Lectins, like Concanavalin A (Con A), play roles in biological recognition and disease processes.

Purpose of the Study:

• To develop a highly sensitive microgravimetric lectin biosensor.
• To utilize carbohydrate-stabilized Au nanoparticles as a signal amplification strategy.
• To detect Concanavalin A (Con A) using a quartz crystal microbalance (QCM) platform.

Main Methods:

• Fabrication of a mannose-modified Au QCM electrode.
• Preparation of mannose-stabilized Au nanoparticles (Au NPs).
• Formation of a sandwich-type complex involving Con A, mannose-modified electrode, and Au NPs.

Main Results:

• The developed biosensor demonstrated high sensitivity for Con A detection.
• Carbohydrate-stabilized Au NPs effectively amplified the signal.
• The microgravimetric lectin biosensor exhibited an amplified frequency response upon Con A binding.

Conclusions:

• A highly sensitive and effective microgravimetric lectin biosensor was successfully developed.
• Carbohydrate-stabilized Au nanoparticles are promising signal amplifiers for biosensing applications.
• This approach offers a potential platform for sensitive Con A detection.