Oxidase can be divided into dioxygenase and monooxygenase which is also called mixed-function oxygenase or hydroxylase; the former is often accompanied by aromatic ring crack. Oxidase is the main enzyme of peroxidase in the body, and is accounted for about half of the total peroxidase enzyme in the body, including D - amino acid oxidase, uric acid oxidase, L- amino acid oxidase and L- α- hydroxy oxidase.