title: Undesirable Enzymatic Browning in Crustaceans: Causative Effects and Its Inhibition by Phenolic Compounds.
abstract: 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.
authors.affiliation: a Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Health and Food Science Precinct , Coopers Plains , Brisbane , Australia.
authors.forename: Nilesh Prakash
authors.initials: NP
authors.lastname: Nirmal
authors.forename: Soottawat
authors.initials: S
authors.lastname: Benjakul
authors.forename: Mehraj
authors.initials: M
authors.lastname: Ahmad
authors.forename: Yasir Ali
authors.initials: YA
authors.lastname: Arfat
authors.forename: Pharkphoom
authors.initials: P
authors.lastname: Panichayupakaranant
mesh_terms: D000818:Animals; D004156:Catechol Oxidase / Q000737:chemistry / Q000187:drug effects*; D003445:Crustacea / Q000201:enzymology*; D005511:Food Handling / Q000379:methods*; D061353:Food Storage; D008548:Melanosis / Q000201:enzymology / Q000517:prevention & control; D010084:Oxidation-Reduction / Q000187:drug effects; D010636:Phenols / Q000494:pharmacology*; D010936:Plant Extracts / Q000494:pharmacology*; D012034:Refrigeration; D012758:Shellfish
chemical_list: D010636:Phenols; D010936:Plant Extracts; D004156:Catechol Oxidase
keywords: Crustaceans; melanosis; phenolic compounds; plant extract; polyphenoloxidase