Silicon biochips for dual label-free and fluorescence detection: Application to protein microarray development

Area of Science:

• Biotechnology
• Materials Science
• Analytical Chemistry

Background:

• Protein microarrays are crucial for biological research and diagnostics.
• Assay development often requires multiple, separate validation steps.
• Current platforms may lack integrated multi-modal detection capabilities.

Purpose of the Study:

• To introduce a novel silicon chip designed for comprehensive protein microarray development, fabrication, and validation.
• To enable simultaneous label-free and fluorescence detection on a single platform.
• To enhance the efficiency and reliability of protein assay workflows.

Main Methods:

• Fabrication of a silicon chip with two distinct oxide layer areas (500 nm SiO2 for interferometry, 100 nm SiO2 for fluorescence).
• Utilizing interferometric detection for label-free protein quantification.
• Employing fluorescence detection for high-sensitivity molecular interaction analysis.
• Performing integrated imaging and quantification within a single experimental run.

Main Results:

• The chip successfully integrates label-free interferometric detection with enhanced fluorescence detection.
• Demonstrated capability for real-time imaging, quality assessment, and quantification of protein arrays.
• Validated the utility of the combined approach for molecular interaction analysis.
• Achieved high sensitivity in fluorescence detection of bioassays.

Conclusions:

• The developed silicon chip offers a versatile and efficient platform for protein microarray applications.
• The integrated dual-detection system significantly aids in assay development and validation processes.
• This technology holds potential for advancing high-throughput biological screening and diagnostics.