Superoxide dismutase (SOD) is an important antioxidative enzyme that catalyzes the dismutation of the superoxide anion into hydrogen peroxide (H₂O₂) or molecular oxygen (O₂).

 The Superoxide Dismutase (SOD) Activity Assay Kit provides a sensitive and convenient way for detection of Superoxide Dismutase (SOD) activity based on a colorimetric method in a variety of biological fluids. When reduction with superoxide anion, WST-1 produces a water-soluble formazan dye, which can be easily detected at 450 nm using a spectrophotometer or an ELISA plate reader. The rate of the reduction with a superoxide anion is linearly correlated to the xanthine oxidase (XO) activity, and is inhibited by SOD.