Use of a modified binding model for the investigation of affinity dependence on antibody concentration in immunoassay systems.

Abstract Affinity parameters obtained from standard calibration curves of radioimmunoassays (RIA) have been shown to decrease with increasing antibody concentration. A modified binding model was introduced in which not only binding capacity but also affinity was influenced by the antibody concentration. This allows a consistent overall description of RIA standards and titration curves for the characterization of binding assays.