*Corresponding author The Effects of Antibacterial and Antioxidant Activities of Sodium Alginate Incorporated With Entromorpha sp. Extract on Common Carp (Cyprinus carpio) Fillet During Chilled Storage

The effect of Sodium Alginate coating enriched with entromorpha algae extract as a natural antioxidant on shelf life of common crap fillet (Cyprinus carpio) from Caspian sea (in 2013) were examined on chilled environment (4 ±1 °c). Carp fillet contains Treatments Sodium alginate (3%) and Sodium Alginate with 1.5 percent Entromorpha algae extract and control (without any additives). Treatments were investigated at regular intervals ( 4 days ) and 16 days for chemical tests (Peroxides, free fatty acids ,Thiobarbituric acid, total volatile nitrogenous bases , PH s ) microbiological tests (number of total and psychrophilic bacteria). According to results, Peroxides, free fatty acids, Thiobarbituric acid, total volatile nitrogenous bases, color and odor on Sodium Alginate treatment with 1.5 percent of Entromorpha algae extract had less change in comparison to other treatments (P< 0.05). Texture and taste on Entromorpha algae extract had better value. The results indicated that Sodium Alginate cover with Entromorpha algae extract is effective on decay rate of toxic chemicals and the sensory status improvement of common carp fillets during storage in cold conditions (4 ±1° C