Biosensor

摘要

In a biosensor comprising an electrically insulating base plate, an electrode system including a working electrode and a counter electrode formed on the base plate, and a reaction layer formed on or in the vicinity of the electrode system, at least a surface of the reaction layer is made porous, so as to provide a biosensor of good response characteristic in which a reaction layer containing an enzyme dissolves quickly into a small amount of a sample solution and the enzyme reaction is effectively utilized. In one embodiment the reaction layer contains the enzyme and an aggregate of fine particles having an average diameter of between 0.1 mu m and 1 mu m. The fine particles may be made of a material selected from a polymer compound, ceramic, glass, diamond and carbon.