TY - JOUR T1 - Antioxidant effect of ascorbic acid on the quality of Cobia (Rachycentron canadum) fillets during frozen storage TT - JF - IFRO JO - IFRO VL - 11 IS - 3 UR - http://jifro.ir/article-1-637-en.html Y1 - 2012 SP - 666 EP - 680 KW - Cobia KW - Lipid oxidation KW - Ascorbic acid KW - Frozen storage N2 - The effect of aqueous solutions of ascorbic acid (AA) on the rancidity development in Cobia (Rachycentron canadum) fillets during frozen storage was studied. Cobia fillets were treated with ascorbic acid (AA 0.25% and AA 0.5%) then stored at -18°C up to 6 months. Rancidity development was measured by several biochemical indices including free fatty acids (FFA), peroxide value (PV), and thiobarbituric acid (TBA) and complemented by the sensory analysis ( odor,  consistency and  appearance). In addition, pH and expressible moisture (EM) were measured during 6 months storage. Proximate composition was also determined in the first day. TBA, PV and FFA levels increased on all treatments due to lipid oxidation. Ascorbic acid showed antioxidative effect on Cobia fillets during frozen storage as indicated by TBA, PV and FFA levels. Results showed that free fatty acid, primary and secondary oxidation products,  EM and pH value of AA- treated samples were significantly lower than those of the control samples (P M3 ER -