Superoxide dismutase(SOD) in eggs can inhibit the photoreduction of nitro-blue tetrazolium (NBT).Thisreaction can be used to quantitatively determine the enzyme activities of SOD.

鸡蛋中的超氧化物歧化酶（SOD）可（NBT）的光化还原，可根据SOD对NBT光化还原的作为酶活性的定量测定。