Biometallization-Based Electrochemical Magnetoimmunosensing Strategy for Avian Influenza A (H7N9) Virus Particle Detection.

A highly sensitive electrochemical immunosensor for avian influenza A (H7N9) virus (H7N9 AIV) detection was proposed by using electrochemical magnetoimmunoassay coupled with biometallization and anodic stripping voltammetry. This strategy could accumulate the enzyme-generated product on the surface of the magneto electrode by means of silver deposition, which amplified the detection signal about 80 times. The use of magnetic beads (MBs) and the magneto electrode could also amplify the detection signal. Furthermore, a bi-electrode signal transduction system was introduced into this immunosensor, which is also beneficial to the immunoassay. A concentration as low as 0.011 ng mL(-1) of H7N9 AIV could be detected in about 1.5 h with good specificity. This study not only provides a simple and sensitive approach for virus detection but also offers an effective signal enhancement strategy for the development of highly sensitive MB-based electrochemical immunoassays.