Capacitive sensor for the allatostatin direct immunoassay

Abstract The feasibility of allatostatin direct immunoassays based on capacitance measurements with TiO 2 modified electrodes is presented. The low conductance and good dielectric properties of the TiO 2 substrate insure good sensitivity. This was proven by a capacitance decrease of about 1 nF cm −2 for a 3000 times diluted insect serum sample. The simple construction and the miniaturisation possibility advocate this structure for direct immunoassay.