Effets de la congélation sur le profil protéique des filets de la Dorade royale (Sparus aurata): comparaison entre le poisson sauvage et d’élevage

Abstract

Changes in electrophoretic profiles of sarcoplasmic (SPP) and myofibrillar (MFP) proteins of frozen (-18°C) wild and farmed gilthead sea bream fillets were assessed during 4 months of storage. Initially, no specific distinctions in the protein profiles were found between wild and farmed fresh fish fillets. Throughout frozen storage, densitometric analysis of MFP and SPP profiles showed minor modifications, particularly in MFP fraction, related to the origin of fish and time of storage. Thus, the optical density of farmed fish low molecular weight peptides (70, 23, 16 and 10 kDa) were affected after 1 month of frozen storage, such changes were observed after 2 months in the wild fish bands of 75, 60, 37 and 18 kDa. The electrophoretic analysis showed that wild sea bream fillets were more resistant to muscle protein disorganization and denaturation, occurring during frozen storage, than farmed fish