| abstract |
A high sensitivity biosensor which responds well even to a trace of sample. The biosensor comprises a first insulating substrate having a working electrode branched into a plurality of pieces and a first counter electrode branched into a plurality of pieces with respective pieces being arranged alternately, a second insulating substrate having a second counter electrode and disposed oppositely to the first insulating substrate, a reagent system containing an oxidation-reduction enzyme, and a sample supply passage formed between the first and second insulating substrates, wherein the pieces of the working electrode and the first counter electrode arranged alternately, the second counter electrode and the reagent system are exposed to the sample supply passage. |