Transmissive Nanohole Arrays for Massively-Parallel Optical Biosensing.

Area of Science:

• Nanotechnology
• Optical Biosensing
• Biotechnology

Background:

• Current biosensing methods often require complex readouts or specialized equipment.
• There is a need for high-throughput, cost-effective biosensing platforms for diverse biological agent detection.

Purpose of the Study:

• To develop and demonstrate a novel high-throughput optical biosensing technique.
• To simplify the readout process in nanohole-based sensing.
• To establish a sensitive and specific method for biological agent detection.

Main Methods:

• A hybrid technique combining optical transmission through nanoholes with colorimetric silver staining.
• Utilizing individually resolvable nanoholes as independent sensors in massive parallel.
• Monitoring nanohole brightness changes via standard optical microscopy for simplified readout.
• Employing enzymatic silver staining to block nanohole transmission for specific detection.

Main Results:

• Simultaneous monitoring of nearly 10,000 nanoholes within a single microscope field of view.
• Demonstrated proof of concept using biotinylated lysozyme (biotin-HEL) as a model analyte.
• Achieved a low detection limit of 0.1 ng/mL for the model analyte.

Conclusions:

• The proposed hybrid optical biosensing technique offers a simplified, high-throughput approach for biological agent detection.
• Nanohole brightness measurement provides an effective readout strategy, enhancing simplicity and scalability.
• This method shows significant potential for sensitive and specific biological detection applications.