Author/Authors :
Karami ، B نويسنده Department of Fisheries, Science and Research Branch, Islamic Azad University, Tehran, Iran , , Moradi ، Y نويسنده Iranian Fisheries Research Organization, P.O. Box: 14155-6116, Tehran, Iran , , Motallebi ، A. A نويسنده Iranian Fisheries Research Organization, P.O. Box: 14155-6116, Tehran, Iran , , Hosseini ، E نويسنده Faculty of Agriculture and Natural Resources, Science and Research Branch, Islamic Azad University, Tehran, Iran , , Soltani ، M نويسنده Department of Aquatic Animal Health, Faculty of Veterinary Medicine. University of Tehran, P.O. Box: 14155-6453, Tehran, Iran ,
Abstract :
The aim of the investigation was to determine the changes in fatty acids profile and chemical quality indices of Red Tilapia fillets during frozen storage at -18°C. The fish were filleted by hand. The prepared fillets were then placed to the polyamide pouches and stored at -18°C for 150 days. Fatty acid profile, sensory properties and chemical quality indices were determined for a five month period. Results showed that 29 fatty acids were identified in the fresh and frozen samples. Polyunsaturated fatty acids (PUFA) were found higher than saturated fatty acids (SFA) in fresh samples but after 150 days of frozen storage this ratio became reverse. Oleic acid and Linoleic acid were the major MUFA (mono unsaturated fatty acids) and PUFA in fresh and frozen samples, respectively. The ratio of n3/n6 decreased from 0.59 to 0.49. The thiobarbituric acid value (TBA. Mg malondialdehyde/kg) increased significantly (p < 0.05) throughout the storage time from 0.03 to 1.26 . Peroxide value (PV), Total volatile bases (TVB-N) and pH value also increased but were well within the limit of acceptability.
