Enzovera Glucose Oxidase (EV-OXR-002) is a high-purity flavoprotein oxidoreductase supplied as a lyophilized powder with a specific activity of ≥50 U/mg, available in 1 g bottles. Glucose Oxidase (GOD) catalyzes the selective oxidation of β-D-glucose to D-glucono-1,5-lactone with simultaneous reduction of molecular oxygen to hydrogen peroxide — one of the most thoroughly characterized enzymatic reactions in biochemistry, forming the basis of clinical glucose diagnostics, food preservation, and oxidative biosensor technologies worldwide.

Mechanism and substrate specificity. Glucose Oxidase (EC 1.1.3.4) is a homodimer (~160 kDa) with one FAD cofactor tightly bound per subunit. In the oxidative half-reaction, the C1 anomeric hydroxyl of β-D-glucose reduces the active-site FAD to FADH₂, generating D-glucono-1,5-lactone. In the reductive half-reaction, molecular oxygen reoxidizes FADH₂ to FAD, producing H₂O₂ in stoichiometric 1:1 ratio with glucose consumed. The enzyme exhibits strict specificity for the β-anomer of D-glucose — α-D-glucose must mutarotate to the β-form before oxidation occurs — and shows negligible activity toward fructose, galactose, mannose, or xylose. This strict selectivity is critical for accurate glucose-only measurements in complex matrices such as whole blood, serum, urine, and multi-sugar food products.

Colorimetric assay coupling. The stoichiometric H₂O₂ generated by GOD is quantified through peroxidase-coupled colorimetric reactions. The most widely used system pairs GOD with horseradish peroxidase (HRP) and a chromogen such as TMB, ABTS, or o-dianisidine: HRP oxidizes the chromogen using the H₂O₂ produced, generating a colored product measured spectrophotometrically at 450–630 nm. This GOD-HRP-chromogen cascade forms the basis of most laboratory glucose assay kits and benchtop clinical analyzers. GOD kinetics (Kₘ for glucose: ~20 mM) make the assay adaptable to glucose concentrations from 0.1 mM to 10 mM with appropriate sample dilution.

Recommended applications:

• Colorimetric and spectrophotometric glucose quantification in serum, plasma, and biological fluids
• Point-of-care blood glucose test strip fabrication in electrochemical sensor formats
• H₂O₂ generation for coupled enzymatic assay and reporter systems
• Food quality control: glucose content determination in beverages, fruit juices, and dairy products
• Antimicrobial food packaging: enzymatic H₂O₂ generation for preservation applications
• Biosensor development and enzyme electrode characterization
• Cell culture media glucose monitoring in bioprocess fed-batch applications