Synergetic chemiluminescence and label-free dual detection for developing a hepatitis protein array

Area of Science:

• Biotechnology
• Analytical Chemistry
• Immunodiagnostics

Background:

• Protein arrays are crucial for high-throughput biomolecular analysis.
• Existing detection methods have limitations in sensitivity or require labels.
• A need exists for versatile detection systems combining label-free and established techniques.

Purpose of the Study:

• To develop and validate a dual detection system for protein arrays.
• To integrate label-free optical interference with chemiluminescence detection.
• To assess the system's performance in detecting hepatitis B surface antigen.

Main Methods:

• Fabrication of a planar protein array targeting hepatitis B surface antigen.
• Quantification of antibody spot densities using optical interference.
• Label-free detection of target binding via optical interference.
• Dual detection (optical interference and chemiluminescence) with secondary antibodies for lower concentrations.

Main Results:

• Optical interference successfully quantified antibody surface densities.
• Label-free detection identified target binding at 10 ng/ml.
• Dual detection accurately measured binding at 1 ng/ml.
• Binding results correlated directly with initial capture probe density.

Conclusions:

• The dual detection system offers both the analytical precision of optical interference and the clinical reliability of chemiluminescence.
• This integrated approach enhances the utility of protein arrays for sensitive and quantitative diagnostics.
• The system demonstrates direct proportionality between binding signal and probe density, ensuring assay accuracy.