Undesirable enzymatic browning mediated by
polyphenol oxidase (E.C. 1.14.18.1) on the surface of seafood from crustaceans have been a great concern to food processors, causing quality losses of seafood products. Seafoods especially from crustaceans are worldwide consumed due to their delicacy and nutritional value. However, black spot formation (
melanosis) is the major problem occurring in crustaceans during postmortem handling and refrigerated storage induce deleterious changes in organoleptic properties and, therefore, decreases commercial value.
Polyphenoloxidase (PPO), the
copper-containing
metalloprotein involved in oxidation of
phenol to
quinone is the major biochemical reaction of
melanosis formation. This enzymatic mechanism causes unappealing blackening in postharvest crustaceans. To alleviate the
melanosis formation in crustaceans, use of phenolic compounds from
plant extract can serve as antimelanotics and appears to be a good alternative to the conventional
sulfites which are associated with health-related disorders. In this review, we focuses on the unique features about the structure, distribution, and properties of PPO as well as mechanism of
melanosis formation and provide a comprehensive deeper insight on the factors affecting
melanosis formation and its inhibition by various antimelanotics including newly discovered plant phenolic compounds.