Effect of nisin on microbial quality of farmed great sturgeon Huso huso in refrigerator and freezing temperatures

Subject Areas : Aquatic Products

محمدرضا قمی ¹ , مسعود Ghane ² , مینا Eghbali ³ , مهدی Nikoo ⁴

1 - دانشگاه آزاد اسلامی تنکابن
2 - Department of Microbiology, Tonekabon branch, Islamic Azad University, Tonekabon, 46817, Iran
3 - Graduated of Microbiology, Department of Microbiology, Tonekabon branch, Islamic Azad University, Tonekabon, 46817, Iran
4 - Department of Fisheries, Faculty of Natural Resources, Urmia University, 5756151818, Iran

Received: 2017-11-09 Accepted : 2018-02-07 Published : 2019-02-20

Keywords: Escherichia coli, Staphylococcus aureus, Nisin, Storage temperature, Farmed beluga,

Abstract :

Effect of nisin on microbial quality of farmed great sturgeon Huso huso in refrigerator and freezing temperatures In this study the effects of nisin (a biotic preservative) (0, 0.2 and 0.4%) on the microbiological quality of farmed great sturgeon (H. huso) slices inoculated by Staphylococcus aureus and Escherichia coli (8 log cfu/ml) during storage (4 and -18 °C) for 10 days was determined. The counts of S. aureus did not change significantly after ten days of storage (P> 0.05) and in other words, it was not affected from different concentrations of nisin and storage temperatures. Frozen samples treated by nisin showed lower counts of E. coli. Nisin at both concentrations had the same effects on reducing the counts of both bacteria. The positive effects of such a low-risk biological preservative in studied food product appearing to reduce the microbial load, therefor its usage in preservation of food is industrially preferable rather than other chemical preservatives. Keywords: Nisin, Storage temperature, Staphylococcus aureus, Escherichia coli, Farmed beluga.