A METHOD FOR DETERMINING KINETIC PARAMETERS OF A REACTION

According to the present invention there is provided a method for determining the kinetic parameters of a reaction between an analyte and ligands which are attached to a test surface of a flow cell, the method comprising the steps of, (a) flowing a first volume of sample fluid (V1), which contains said analyte, over the test surface, between a first point in time (t1) to a second point in time (t2); (b) flowing a first volume of buffer fluid (Vb1), which is without analyte, over the test surface, between a third point in time (t3) to a fourth point in time (t4); (c) flowing at least a second volume of sample fluid (V2), which contains said analyte, over the test surface, between a fifth point in time (t5) to a sixth point in time (t6); (d) flowing at least a second volume of buffer fluid (Vb2), which is without analyte, over the test surface, between a seventh point in time (t7) to a eight point in time (t8); (e) using a sensor to measure the binding of analyte to ligands on the test surface to obtain a binding curve; (f) using the only the parts of the binding curve which are in predefined interval time periods, without using the other parts of the binding curve, to determine the kinetic parameters.