SPR systems exploit the phenomenon of surface plasmon resonance to monitor the interaction between molecules in a real time. One of the interactants is immobilized on the sensor chip surface, while the other is passed over that surface in solution. Applications of SPR include biotherapeutic and drug discovery research, as well as protein activity and stability analysis. SPR is suitable also for characterization of membranes, lipids, nucleic acids and micellar systems. SPR system represents one platform for characterization of biomolecular interactions - kinetics, affinity, specificity, concentration and thermodynamics.