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

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