High-throughput optimization of surfaces for antibody immobilization using metal complexes.

Area of Science:

• Materials Science
• Biotechnology
• Surface Chemistry

Background:

• Developing surfaces with high antibody-binding capacity is crucial for sensitive immunoassays.
• Existing methods often require complex surface modifications or post-treatments.

Purpose of the Study:

• To discover and optimize novel metal-containing surfaces for superior antibody binding.
• To demonstrate the utility of these surfaces in various immunoassay formats.

Main Methods:

• High-throughput screening of a 1600-member library of metal-containing surfaces synthesized on polyvinylidenedifluoride (PVDF) membranes.
• Graft modification using maleic anhydride-styrene copolymer, followed by reaction with secondary amines and metal complex printing.
• Testing antibody binding using chemiluminescence assays and transfer to Luminex beads for flow cytometry.

Main Results:

• Identified 11 lead surfaces with a 0.7% hit rate from the initial library screen.
• Optimized hits and generated additional leads from a smaller library.
• Demonstrated increased assay sensitivity in a Luminex tumor necrosis factor immunoassay using the novel surfaces.

Conclusions:

• Novel metal-containing surfaces offer efficient and essentially irreversible antibody binding.
• These surfaces simplify immunoassay development by eliminating the need for polyhistidine tags or oxidation treatments.
• The developed surfaces show significant potential for enhancing diagnostic assay performance.