Multiplexed, rapid point of care platform to quantify allergen-specific IgE

Area of Science:

• Biotechnology
• Medical Diagnostics
• Surface Chemistry

Background:

• Inconsistent probe immobilization on microarrays compromises diagnostic accuracy in healthcare.
• Existing diagnostic technologies face challenges with chip-to-chip variability and quantitative analysis.

Purpose of the Study:

• To develop a calibrated, multiplexed, dual-modality point-of-care detection platform.
• To correlate label-free measurement of surface probe density with captured labeled secondary antibody.
• To improve the reliability and quantitative accuracy of diagnostic assays.

Main Methods:

• Utilized a dual-modality approach combining label-free and fluorescent detection.
• Developed a method for single spot analysis based on fluorophore detection.
• Optimized substrate for a 10-fold gain in fluorescence signal.
• Calibrated measurements using both modalities to determine probe and bound target density.

Main Results:

• Achieved over 90% linear correlation between surface-bound probe amount and captured target fluorescence.
• Demonstrated applicability across various targets including IgG, allergens (Ara h 1, Phl 5a), and β-lactoglobulin.
• Platform shows independence from chip-to-chip variability.

Conclusions:

• The developed platform offers a calibrated, quantitative, and reliable method for diagnostic assays.
• Its compact design and rapid results are suitable for point-of-care applications.
• This technology addresses key limitations in current microarray-based diagnostics.