Measuring Biomolecular Binding Events with a Compact Disc Player Device

Read the fine print: Biomolecular binding events can be counted with a readout system based on compact disc (CD) pickup technology. An immunoassay of C-reactive protein was performed by microcontact printing of antibodies onto a support, autometallography, and imaging by a CD reader mounted on an optical microscope (see picture). The dynamic range was four orders of magnitude with a detection limit of 1 pM.