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Antigen-antibody Binding And Mass Transport By Convection And Diffusion To A Surface: A Two-dimensional Computer Model Of Binding And Dissociation Kinetics.
Published 1993 · Chemistry, Medicine
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The kinetics of binding and dissociation between a soluble analyte and an immobilized ligand on or near a surface are described numerically by an iterative computer model. The model is applied to a microflow chamber which is used for surface plasmon resonance measurements. It calculates diffusion perpendicular to the surface, flow parallel to the surface, and the interaction between any number of soluble and immobilized species. If the reaction between analyte and ligand is fast, binding and dissociation are influenced by the transport of the analyte to or away from the surface. In this case the measurement yields apparent association and dissociation rate constants which are not identical with the reaction rate of analyte and ligand. The transition between mass transport-controlled processes and reaction-controlled processes is described and attention is drawn to possible misinterpretations of experimental binding and dissociation curves. The measurement of rate constants higher than allowed by the conventional technique can be performed by elution of the analyte with a second analyte of low molecular weight.