In enzymology, a retinal oxidase () is an enzyme that catalyzes the chemical reaction retinal + O2 + H2O retinoic acid + H2O2 The 3 substrates of this enzyme are retinal, O2, and H2O, whereas its two products are retinoic acid and H2O2. This enzyme belongs to the family of oxidoreductases, specifically those acting on the aldehyde or oxo group of donor with oxygen as acceptor. The systematic name of this enzyme class is retinal:oxygen oxidoreductase. This enzyme is also called retinene oxidase. This enzyme participates in retinol metabolism. References EC 1.2.3 Enzymes of unknown structure