Surface plasmon resonance: a general introduction.

Surface plasmon resonance (SPR) analysis is rather unique in that it allows assay of binding constants (affinity) and kinetic analysis of binding phenomena. This introductory chapter deals with some specific features that are relevant to many diverse applications. The role and impact of kinetics in biomolecular interactions is highlighted. A concise description of the physical principles of the SPR phenomenon is given from a practical point of view, such that some possibilities and limitations of the method can be rationalized, e.g., depth of the evanescent field. A specific condition that may come forward in kinetic analysis is mass transport limitation (MTL). A practical model is presented, which allows estimation of the extent of MTL. Based on this model it can be rationalized whether MTL can be avoided by experimental design. In this framework also rules are presented to convert SPR signals (RU or millidegree) to mass/surface unit. The chapter concludes with an overview of commercially available SPR equipment.