Enzovera Glucose Dehydrogenase (GDH-FAD) (EV-OXR-001) is a flavin adenine dinucleotide–dependent oxidoreductase supplied as a lyophilized powder with a specific activity of ≥300 U/mg, available in 500 KU and 10 g bottles. GDH-FAD catalyzes the oxidation of β-D-glucose to D-glucono-1,5-lactone using FAD as the electron acceptor, transferring electrons to artificial mediators rather than to molecular oxygen — a property that fundamentally distinguishes it from glucose oxidase and makes it the preferred enzyme for electrochemical glucose biosensors, continuous glucose monitoring devices, and enzymatic biofuel cells where oxygen-independent amperometric measurement is required.

Mechanism and cofactor chemistry. GDH-FAD (EC 1.1.99.10) employs a covalently bound FAD prosthetic group at its active site. During catalysis, the anomeric hydroxyl of β-D-glucose reduces the active-site FAD to FADH₂, generating D-glucono-1,5-lactone. The reduced FADH₂ is then reoxidized by an artificial electron mediator — such as phenazine methosulfate, ferrocene derivatives, osmium complexes, or quinone-based mediators — which transfers electrons to a working electrode in an amperometric biosensor. Because the FAD cofactor is tightly bound and continuously regenerated by the mediator, the system operates without exogenous soluble cofactors, enabling reagentless biosensor designs. This contrasts sharply with NAD⁺-dependent glucose dehydrogenases, which require addition of the expensive, diffusible cofactor NAD⁺ at every measurement cycle.

Advantages over glucose oxidase. Glucose oxidase uses molecular oxygen as its natural electron acceptor, generating H₂O₂ — a product that can deactivate the enzyme, contaminate electrode surfaces, and introduce measurement error at low oxygen tensions clinically relevant in continuous blood glucose monitoring. GDH-FAD bypasses oxygen dependency entirely, maintaining accurate glucose readings across the full range of physiological oxygen partial pressures and eliminating H₂O₂-related electrode fouling. These properties make GDH-FAD the biosensor enzyme of choice for modern continuous glucose monitors (CGMs) used in diabetic patient management.

Recommended applications:

• Amperometric glucose biosensor construction for point-of-care and clinical diagnostics
• Continuous glucose monitoring (CGM) sensor fabrication
• Enzymatic biofuel cell anode as a glucose-oxidizing catalyst
• Self-powered biosensor systems coupling glucose oxidation to power generation
• Glucose assay and monitoring in fermentation broth and bioprocess control systems
• Enzyme activity calibration and reference material production
• Research into mediated electron transfer mechanisms at enzyme-electrode interfaces