Patent ID: 6790327
Filing Date: 2004-09-14
Classification: C12Q

Abstract:
A biosensor for determining the concentration of a substrate in a sample solution, said biosensor comprising:an electrically insulating base plate; an electrode system having a working electrode, a counter electrode and a third electrode to be utilized as an interfering substance detecting electrode, said working electrode, said counter electrode and said third electrode being formed on said base plate; a reaction layer comprising an oxidoreductase and an electron mediator, said reaction layer being formed on said electrode system so as to cover said working electrode and said counter electrode, said reaction layer not covering said third electrode; and a cover member forming a sample solution supply pathway to introduce a sample solution from a sample solution supply port into said reaction layer on said base plate, wherein said third electrode being located closer to said sample solution supply port than said reaction layer and said entire working electrode being located closer to said sample solution supply port than said counter electrode.