Diffractive Protein Gratings as Optically Active Transducers for High-Throughput Label-free Immunosensing.

Area of Science:

• Biomedical Engineering
• Analytical Chemistry
• Nanotechnology

Background:

• Label-free biosensing is crucial for real-time monitoring of biological interactions.
• Diffractive gratings offer a platform for optical sensing applications.
• Developing cost-effective and scalable biosensing technologies remains a key challenge.

Purpose of the Study:

• To develop a novel label-free biosensing approach utilizing bioreceptor networks patterned as diffractive gratings (biogratings).
• To demonstrate the capability of biogratings for quantitative and multiplexed sensing of biointeractions.
• To explore the potential of this technology as a portable and scalable analytical tool.

Main Methods:

• Fabrication of functional biogratings on nanogrooved scaffolds using microcontact printing.
• Development of an analytical scanner based on a LightScribe compact disk drive to measure diffraction patterns.
• Quantitative sensing of biointeractions by measuring changes in diffraction efficiency.

Main Results:

• Successful immunoassay of Immunoglobulin G (IgG) using the biograting approach.
• Achieved well-correlated responses with quantification and detection limits of 1.3 nM and 5.2 nM for IgG.
• Demonstrated label-free and multiplexed detection capabilities.

Conclusions:

• The developed biograting biosensing approach offers a novel, label-free method for quantitative biointeraction analysis.
• The technology shows promise for cost-effective, portable, and scalable analytical devices.
• This platform provides a new avenue for developing advanced diffractive grating-based biosensors.