Ascorbate peroxidase
Encyclopedia
Ascorbate peroxidases are enzymes that detoxify peroxides such as hydrogen peroxide
Hydrogen peroxide
Hydrogen peroxide is the simplest peroxide and an oxidizer. Hydrogen peroxide is a clear liquid, slightly more viscous than water. In dilute solution, it appears colorless. With its oxidizing properties, hydrogen peroxide is often used as a bleach or cleaning agent...

 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

APX is an integral component of the glutathione-ascorbate cycle
Glutathione-ascorbate cycle
The glutathione-ascorbate cycle is a metabolic pathway that detoxifies hydrogen peroxide , which is a reactive oxygen species that is produced as a waste product in metabolism...

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

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