An electrochemical specific binding assay of a ligand (e.g., antigen, hapten or antibody) wherein at least one of the components is enzyme-labelled, and which includes the step of determining the extent to which the transfer of electrons between the enzyme substrate and an electrode, associated with...http://www.google.es/patents/US5149630?utm_source=gb-gplus-sharePatente US5149630 - Methods of assay
