Author/Authors :
Mirshekari ، S نويسنده Department of Food Science, Bandarabas Branch, Islamic Azad University, P.O. Box 79159-1311, Bandarabas, Iran , , Safari ، R نويسنده Department of Food Science & Biotechnology, Research Organization of Caspian Sea, P.O. Box 961, Sari, Mazandaran, Iran. , , Adel ، M نويسنده Department of Aquatic Animal Health & Disease, Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research Education and Extension Organization (AREEO), P.O.Box: 13185-116, Tehran, Iran. , , Motalebi Moghanjoghi ، A.A نويسنده Agricultural Research, Education and Extension Organization, Iranian Fisheries Science Research Institute, P. O. BOX: 14155-6116 Tehran, Iran , , Khalili ، E نويسنده Department of Food Quality Control, Institute of Zoonoses Research, Shahrekord University, P.O. Box 115, Shahrekord, Iran ,
Abstract :
This study was done to evaluate the antimicrobial and antioxidant effects of nisin Z (0.02 %) and sodium benzoate (1.5 and 2.5 %) in vacuum packed Caspian Kutum (Rutilus frisii) fillet stored at 4°C. Microbial changes [aerobic plate counts (APC), psychrotrophic counts (PTC) and lactic acid bacteria] and chemical indices [peroxide value and total volatile basic nitrogen (TVB-N)] were determined in days 0, 4, 8, 12 and 16. Results showed that PV and TVB-N in control samples (the sample dipped in prechilled distilled water) were deteriorated after 12 days compared to preserved samples which were acceptable after 16 days. Microbial tests indicated that control samples contained APC and PTC bacteria in day 16 more than standard limit, whereas treatment samples were in the acceptable range. In case of lactic acid bacteria, after 16 days, all samples were in the acceptable range. Results of chemical and microbial analysis showed that simultaneous use of nisin Z and sodium benzoate could increase the shelf life of vacuum packed R. frisii.
