Ascorbate peroxidase

Ascorbate peroxidases (or APX) are enzymes that detoxify peroxides such as hydrogen peroxide using ascorbate as a substrate. The reaction they catalyse is the transfer of electrons from ascorbate to a peroxide, producing dehydroascorbate and water as products.

Ascorbate + Hydrogen peroxide → Dehydroascorbate + Water

C6H8O6 + H2O2 → C6H6O6 + 2 H2O

These enzymes are commonly hemoproteins and the haem cofactor is the site of the oxidation-reduction reaction shown above.