Ceruloplasmin is a copper-containing protein in plasma. It functions in copper transport and also exhibits oxidase activity, serving as an important antioxidant in extracellular fluids.
Assay Principle: Ceruloplasmin catalyzes the oxidation of o-dianisidine dihydrochloride to produce a red-colored product, which exhibits a characteristic absorption peak at 540 nm. The activity of ceruloplasmin is determined based on this reaction.