Apparatus and method for detecting an analyte

The invention relates to a device and a corresponding method for detecting and / or quantitating an analyte (6), comprising a base matrix (2) and magnetized nanoparticles (4) which are movably arranged in or on the basic matrix (2) and in which capture molecules (10) are anchored, which bind specifically to the analyte (6), wherein the movability of the nanoparticle (4) in the basic matrix (2) can be influenced and magnetically read by a binding of the analyte to be detected (6) to the capture molecules (10) is.