To test the stability of the bioelectrode, the amperometric response of the Fc12-PF6/MO/GOx bioelectrode to 6 mM glucose was assessed by CA at an applied potential of 0.85 V vs Ag|AgCl (3 M KCl). After measuring the activity, the bioelectrode was stored in a PB solution (pH 7) at room temperature (20˚C).