In presence of the O2 scavenger, the charge values show excellent agreement with those obtained under inert atmosphere except for the glucose concentration in the low millimolar range. The time needed for dissolution of all the components of the O2-scavenger may account for this effect that was not observed in the electrochemical cell having all components predissolved (Figure ). Nevertheless, the glucose reading in presence of the scavenger are highly accurate the normal concentration range for human (4 to 10 mmol L -1 , green area in Figure and) and in the high concentration range which are the most relevant to diabetes management with respect to need insulin intake. The sensitivity of the biosensor with O2 scavenger exhibits a sensitivity of 114.5 µC mM -1 , with a detection limit of 0.72 mM (Figure ).