Document Type : Research Paper
Department of Fisheries, College of Natural Resources, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Mazandaran, Iran
Department of Fisheries, Advanced Educational Center, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Mazandaran, Iran
Department of Veterinary, College of Veterinary, Babol Branch, Islamic Azad University, Babol, Mazandaran, Iran
Individual and combined effectsof Nisin Z (1.5%) and sodium citrate (2%) in air-packed Caspian Kutum fillets during the refrigerated storage at 4°C was investigated. Changes in some quality indexes of fish including chemical attributes including TVB-N, PV and TBA and microbial communities counts including mesophilic (TMC), psychrophill (TPC) and lactic acid bacteria (LAB) were determined during days of 0, 3, 6, 9 and 12. The results showed that TVB-N, PV and TBA indices in treatments were higher than control. Mesophilic and psychrophill bacteria in control sample (with 6.53 and 6.71 CFU/g, respectively) reached to acceptable amount, while treatments containing preservatives showed a better condition in both TPC (with 6.63 to 6.93 CFU/g) and TMC (with 6.67 to 6.90 CFU/g) (P<0.01). Also, growth of LAB has controlled at 9 days (with 6.88 CFU/g) but stopped in treatment samples at the same days (P<0.01). The results revealed that Nisin Z in combination with sodium citrate can therefore be used as the effective preservatives to shelf-life of Caspian Kutum fillets during refrigerated storage.