Abstract: The invention relates to a computer-implemented method for determining at least one kinetic parameter for the interaction of an analyte in solution with an immobilized ligand from a data set comprising a plurality of different binding curves, each of which represents the progress of the interaction of the analyte with the ligand with time, comprising the steps of: a) performing at least one fit of the whole data set or subsets thereof to a predetermined kinetic model for the interaction; b) based on the result of the fit or fits performed in step a), identifying and excluding binding curves of unacceptable quality; c) performing a final fit to the remaining data set; and d) obtaining therefrom the kinetic parameter or parameters. The invention also relates to an analytical system for carrying out the method, as well as a computer program, computer program product and computer system for performing the method.

Abstract: The invention relates to a method of characterizing interaction between two species in a liquid environment, wherein a liquid comprising said at least one species is passed as a flow through a measurement system, and wherein the interaction takes place within said measurement system. The method comprises generating a concentration gradient of at least a first one of said species or of at least one other species having an influence on the interaction or on interacted components. The flow of liquid is passed through a sensor device, and a result of interaction between said at least two species is detected. The flow of liquid is intersected at least once with a further liquid before the flow is passed through said sensor, so as to create at least two separated liquid segments having different concentrations of at least one of said species forming the concentration gradient.

Abstract: A method of determining kinetic parameters for a reversible molecular interaction between a ligand immobilized to a solid support surface and a binding partner to the ligand in solution, comprises sequentially, without intermediate regeneration or renewal of the immobilized ligand, flowing a plurality of fluid volumes containing different known concentrations of the binding partner over the solid support surface, monitoring the momentary amount of binding partner bound to the solid support surface related to time and solution concentration of binding partner and collecting the binding data, and determining the kinetic parameters by globally fitting a predetermined kinetic model for the interaction between the binding partner and the immobilized ligand to the collected binding data, which model allows for mass transport limitation at the solid support surface.

Abstract: Multivariate type assay methods are disclosed which comprise co-immobilizing different groups of ligands on respective discrete areas of a solid support surface, sequentially contacting the different areas with single or multiple analytes, detecting interactions of the analytes with the ligand groups, and determining therefrom the amount of ligand-binding of each analyte.

Abstract: A method of analysis wherein molecular interactions at one or more sensing surface areas are detected and respective response curves representing the progress of each interaction with time are produced, and wherein a resulting set of response curves is subjected to a quality assessment procedure which comprises representing the response curves with one or more quality descriptors, applying a quality classification method to the descriptors to find outliers, and removing the outliers. The invention also relates to an analytical system including means for classifying the response curves with regard to quality, a computer program for performing the classification, and a computer program product containing the program.

Abstract: Surface regeneration of affinity biosensors and characterization of biomolecules associated therewith by multivariate technique employing cocktails of regeneration agents to optimize regeneration of biosensor surface and/or characterize biomolecules associated therewith. Kits and stock solutions for use in the context of this invention, as well as associated computer algorithms are also disclosed.