The use of regenerable, affinity ligand-based surfaces for immunosensor applications

Area of Science:

• Biochemistry
• Biosensor Technology
• Immunology

Background:

• Antibody regeneration is crucial for reusable biosensor formats, enabling real-time detection.
• Antibody avidity and sensitivity to regeneration conditions pose significant challenges.
• Existing methods struggle with efficient antibody surface regeneration and consistent kinetic analysis.

Purpose of the Study:

• To evaluate the difficulties in regenerating antibody-binding surfaces for biosensing.
• To explore affinity-capture as an alternative strategy for improved surface regeneration and kinetic analysis.
• To compare the performance of different affinity ligands (Protein A, G, anti-Fc) for antibody immobilization.

Main Methods:

• Investigated antibody-antigen interactions using polyclonal anti-chlorpyriphos and recombinant CD4 systems.
• Employed affinity-capture surfaces with Protein A, Protein G, and polyclonal anti-mouse Fc.
• Analyzed interaction progress curves for captured monoclonal anti-GST antibody binding to glutathione-s-transferase (GST).

Main Results:

• Demonstrated challenges in regenerating antibody surfaces using direct immobilization methods.
• Showcased affinity-capture's ability to facilitate surface regeneration and directed immobilization.
• Protein A affinity-capture surfaces yielded ideal pseudo-first-order kinetic interaction curves, unlike Protein G and anti-Fc surfaces.

Conclusions:

• Affinity-capture surfaces provide a superior alternative for antibody immobilization and regeneration in biosensing.
• Protein A-based affinity-capture surfaces enable ideal kinetic analysis, overcoming limitations of direct immobilization.
• This approach enhances the reliability and reusability of biosensor platforms for various applications.