Hence these moderate activity changes induced by the products of the AOx-based O2 scavenger are not critical with respect to the glucose biosensing applications. These experiments also demonstrate that near saturating concentration of paraformaldehyde do not induce major deactivation of GOx. All experiments were performed in phosphate buffer (5 mL, pH 7.5, 100 mM) exposed to ambient air unless stated otherwise. Scavenger contains AOx (10 U mL -1 ), CAT (2000 U mL -1 ), and paraformaldehyde (5 mg mL -1 ) or EtOH (50 mM). The GCEs were modified with Os-complex modified polymer (50 wt%), GOx (40 wt%) and PEGDGE (10 wt%) with a total loading of 200 μg cm -2 .