Fully Aqueous Self-Assembly of a Gold-Nanoparticle-Based Pathogen Sensor.

Area of Science:

• Nanotechnology
• Biomolecular Engineering
• Biosensing

Background:

• Surface plasmon resonance (SPR) is a sensitive technique for studying biomolecular interactions but is often cost-prohibitive for routine clinical diagnostics.
• Existing methods for biosensor development can be complex and expensive, limiting their widespread application.

Purpose of the Study:

• To develop a simplified, cost-effective method for creating virus-detecting biosensors using gold nanoparticle (AuNP) assemblies.
• To demonstrate the formation and characterization of protein sensor layers on AuNPs for detecting specific biomolecules.

Main Methods:

• Fabrication of AuNP assemblies on silanized glass surfaces using aqueous buffers at room temperature.
• Utilizing localized surface plasmon resonance (LSPR) to monitor the assembly of protein scaffolds on AuNPs.
• Employing neutron reflectometry to analyze the structure of the biological layer on AuNPs.
• Integrating in vitro-selected single-chain antibody (scFv)-membrane protein fusions as artificial receptor layers within AuNP-coated glass capillaries.

Main Results:

• Successfully formed AuNP assemblies on glass substrates, exhibiting distinct LSPR absorbance peaks.
• Demonstrated the self-assembly of oriented protein sensor layers on AuNPs.
• Validated the function of artificial flu sensor layers using LSPR in a capillary-based system.
• Showcased a simplified, low-cost approach for creating specific protein sensors.

Conclusions:

• This work presents a straightforward method for constructing oriented protein sensor arrays on nanostructured surfaces.
• The developed biosensor platform offers a cost-effective alternative for clinical sample analysis, utilizing artificial receptor proteins.
• The approach simplifies sensor fabrication and enables rapid production of low-cost, highly specific sensor proteins.