Microchip-based Homogeneous Immunoassay Using a Cloned Enzyme Donor

We have realized a cloned enzyme donor immunoassay (CEDIA) on a microchip in 96 s. CEDIA is a homogeneous immunoassay, based on the bacterial enzyme beta-galactosidase, which was genetically engineered into two inactive fragments: an enzyme donor and an enzyme acceptor. A model analyte was theophylline, and the detectable concentration range was from 0 to 40 mu g mL(-1). Our CEDIA using a microfluidic device was very simple and rapid, unlike microchip-based heterogeneous immunoassays and CEDIA on a well-type microchip.