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.

鸡蛋中的超氧酶（SOD）可以抑制蓝四唑（NBT）的光，可以根据SOD对NBT光的抑制作为酶活性的定量测定。