Abstract
Microbial (psychrotrophic, mesophilic aerobic bacteria and Enterobacteriacae counts), and chemical analysis [pH, total volatile bases nitrogen (TVB-N), lipid oxidation (Thiobarbituric acid reactive substance, TBARS)] of rainbow trout ( Oncorynchus mykiss) fillets in air (control), vacuum and modified atmosphere packaging (MAP) with various gas mixtures conditions at 4±1 °C were determined. The gas mixtures evaluated were 100% CO 2, 2.5% O 2+7.5% N 2+90% CO 2 and 30% O 2+30% N 2+40% CO 2. Psychrotrophic bacteria count was above 1×10 7 cfu/g on the 12th day in 100% CO 2. However; mesophilic bacteria count was below 1×10 6 cfu/g at the end of the 14-day storage period. Enterobacteriaceae count was significantly lower in samples packaged with MAP. Lipid oxidation increased rapidly after 6 days of storage in the samples containing 30% O 2. While minimum TBARS values were recorded in fillets containing 100% CO 2 and vacuumed fillets, the lowest TVB-N values were obtained in fillets with 100% CO 2.
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