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- W2156722900 abstract "Assessment of high-affinity antibody-antigen binding parameters is important in such diverse areas as selection of therapeutic antibodies, detection of unwanted hormones in cattle and sensitive immunoassays in clinical chemistry. Label-free assessment of binding affinities is often carried out by immobilization of one of the binding partners on a biosensor chip, followed by monitoring the binding equilibrium of the other partner. However, for the measurement of high-affinity binding, with dissociation constants in the picomolar range or lower, equilibration times exceed practical limits and one has to resort to the measurement of sorption kinetics. Here we evaluate a new technique, using PEIA(1)-ellipsometry and establishment of equilibrium in solution. Binding parameters are determined for two high-affinity anti-interleukin 6 antibodies, anti-IL6.16 and anti-IL6.8, and compared with values obtained by a bioassay, based on IL6-dependent cell growth, and with values obtained by a standard technique based on SPR.(2) The high affinities of both antibodies as found with the bioassay (5 and 50pM for anti-IL6.8 and anti-IL6.16, respectively), could be conveniently measured by PEIA-ellipsometry. Using SPR, equilibrium measurements indeed proved too time-consuming and analysis of adsorption/desorption kinetics revealed that the binding of the antibodies on the chip caused the appearance of different populations of antibodies with different affinities." @default.
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- W2156722900 date "2011-02-01" @default.
- W2156722900 modified "2023-09-26" @default.
- W2156722900 title "Label-free assessment of high-affinity antibody–antigen binding constants. Comparison of bioassay, SPR, and PEIA-ellipsometry" @default.
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- W2156722900 doi "https://doi.org/10.1016/j.jim.2010.11.010" @default.
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