Biosensor with divalent metallic salt

摘要

The present invention provides a cost-effective biosensor which is stable against preservation by reducing the amount of enzyme used. The biosensor comprises an electrically insulating base plate, an electrode system including at least a working electrode and a counter electrode formed on the base plate, a reaction layer containing at least an enzyme and an electron acceptor which is formed on or in the vicinity of the electrode system, and a divalent water-soluble metallic salt provided in or in the vicinity of the reaction layer.