Patent ID: 8608919

Claim:
An impedimetric biosensor for directly determining the presence of analytes in a sample characterised in that it comprises: i) an insulating substrate or non-insulating substrate covered with an insulating layer, ii) at least, a pair of chemically inert interdigitated electrodes and formed with a highly electrically conductive material, disposed on the substrate and each pair of digits separated, but not covered, by iii) a barrier made of an insulating material into which welding points open for external wire connection to each of the electrodes, wherein the insulating barrier comprises a thickness of the insulating layer which defines the height of the barrier separating two adjacent digits, the thickness comprising from 50% to 150% of the distance separating the centres of the pair of consecutive interdigitated electrodes, and iv) chemically immobilised receptor molecules on the surface of the insulating material of the barriers.