“…10,11 In this paper, a facile synthetic process enabling the direct coordination of pyridyl-N to pentacyanoferrate for the detection of small organic molecules is reported. 12,13 In particular, two novel strategies are employed to design the homogeneous electrochemical immunoassay system, as follows: First, the synthesized complex between pyridyl-N and pentacyanoferrate was not only an excellent electroactive molecule, but also provided direct conjugation to the antibody for the detection of the target molecules. Second, the proposed homogeneous electrochemical immunoassay is relatively simple, inexpensive and easily manipulated.…”