SPRi Technology

Surface Plasmon Resonance imaging combines the sensitivity of classical SPR with array-based spatial resolution. A polarized light source excites surface plasmons on a gold-coated sensor chip; changes in refractive index at the surface — caused by biomolecular binding — are detected in real time across hundreds of spots simultaneously.

Because detection is label-free, SPRi avoids the conformational changes and steric hindrance that fluorescent tags can introduce, yielding kinetic data (association and dissociation rates) that more closely reflects native binding behaviour.

Surface Plasmon Resonance imaging represents a significant advancement in the study of biomolecular interactions, offering researchers the ability to monitor binding events in real time without the need for labels. This technology utilizes a gold-coated sensor chip where changes in refractive index are detected as molecules interact at the surface. The SPRi approach combines the sensitivity of traditional SPR with spatial resolution across an array, enabling simultaneous analysis of multiple targets. This makes it particularly valuable for applications in drug discovery, antibody characterization, and protein interaction studies where high-throughput data is essential for understanding complex biological systems.

The instrumentation developed for SPRi allows scientists to conduct multiplex detection across dozens or even hundreds of spots on a single sensor chip. This parallel processing capability dramatically increases experimental efficiency while maintaining the label-free detection that preserves native molecular behavior. Researchers can observe association and dissociation kinetics in real time, gaining insights into binding affinity and specificity that are critical for therapeutic development. The technology has found particular utility in screening peptide libraries, characterizing monoclonal antibodies, and studying protein-protein interactions within the growing field of proteomics and systems biology.

Modern SPRi systems are designed with user-friendly interfaces that streamline experimental workflow from chip preparation through data analysis. The optical configuration typically employs a polarized light source and a sensitive detector array to capture high-resolution images of the sensor surface. Temperature control and fluidic systems ensure stable conditions for reproducible measurements across runs. As the demand for rapid, information-rich biomolecular analysis continues to grow across pharmaceutical and academic research settings, SPRi technology stands as a powerful tool for generating meaningful kinetic data without the complexity associated with alternative labeling approaches.

SPRi technology serves a broad range of bio-affinity investigation needs:

• Peptide screening — map epitopes and identify binding motifs across large peptide libraries.
• Antibody characterization — rank candidates by affinity and specificity early in development.
• Protein–protein interaction studies — quantify binding kinetics without modifying either partner.
• Small-molecule fragment screening — detect low-molecular-weight hits in label-free format.
• Nucleic acid hybridization — monitor DNA/RNA probe binding for biosensor and diagnostic research.