Superoxide dismutase is modified with lauric acid to improve its stabillity. Activated lauric acid was reacted with bovine Cu, Zn-superoxide dismutase at 40℃ for 1h and it was further purified by a Sephacryl S-200 colum. There are 93% recovery of enzyme activity from the resulting lauric acid-superoxide dismutase conjugate. The specific activity of this enzyme product was 6000U / mg. The modified enzyme showed enhanced stability, substantially free from immunogenicity and prolonged its halflife in blood. As a consequence. it can beneficially be used as an enzyme for cosmetics and food industry.