Determination the optimal concentration of Ginger (Zingiber officinale) bioactive compounds incorporated in slurry ice for short-term storage of Rainbow trout (Oncorhynchus mykiss)

In order to determine the optimal concentration of Ginger bioactive slurry ice, for short-term storage of Rainbow trout, four different concentrations of extracts (100, 200, 300 and 400 mg / L) and essential oil (500, 1000, 1500 and 2000 mg / L) were examined. To evaluate the integration effects of ginger bioactive compounds with ice slurry, ice slurry shelf life, substrate temperature and pH were measured. By using color measurement (L *, a *, b * and WI) and microbial analysis (TVC and PTC) the effect of Ginger bioactive ice slurry on the rainbow trout fillet was measured. the mentioned concentrations of essential oils and extracts, did not have any significant effect on the ice slurry shelf life, temperature and pH. Based on colorimetric tests, results showed that different treatments did not alter the color of the fillets. Ice slurry enriching with ginger extracts and essential oils, inhibits the total and psychrophic bacterial count. Total and psychrophic bacterial count of samples treated with the 200 mg / l ginger extract and 1500 g / l ginger oil was significantly less than other treatments. Based on performed tests, 200 mg / l extract and 1500 mg / l essential oil, were selected as the optimal concentrations of Ginger bioactive ice slurry.