A reliable determination of the biologically relevant, active concentration of a biomolecule is important in several fields of quality control in pharmaceutical developement. Heterogeneity of samples can be due to incorrect protein folding, aggregation, chemical or posttranslational modifications of amino acids or the presence of different steroisomers. The use of SPR biosensor technology enables a determination of active concentrations of a biomolecule on the basis of a high affinity interaction with a specific binding partner, allowing rate-based as well as end point measurements.
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