Abstract
Association ( k a) and dissociation ( k d) rate constants of three monoclonal antibodies raised against tobacco mosaic virus were determined using a biosensor technique based on surface plasmon resonance (BIAcore, Pharmacia). Dissociation rates were constant over the 4–400 nM antibody concentration range whereas apparent association rates decreased over this range probably due to an increased saturation level of the antigen. Affinity constants K calculated from the ratio of k a k d were in reasonable agreement with values obtained under equilibrium conditions by two standard methods based on enzyme immunoassay.
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