Effects of modified atmosphere and vacuum packaging on microbiological and chemical properties of rainbow trout (Oncorynchus mykiss) fillets

Aras Hisar Ş., HİSAR O., Kaya M., Yanık T.

INTERNATIONAL JOURNAL OF FOOD MICROBIOLOGY, vol.97, no.2, pp.209-214, 2004 (SCI-Expanded) identifier identifier identifier identifier


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 degreesC were determined. The gas mixtures evaluated were 100% CO2, 2.5% O-2+7.5% N-2+90% CO2 and 30% O-2+30% N-2+40% CO2. Psychrotrophic bacteria count was above 1 x 10(7) cfu/g on the 12th day in 100% CO2. However; mesophilic bacteria count was below 1 x 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% CO2 and vacuumed fillets, the lowest TVB-N values were obtained in fillets with 100% CO2. (C) 2004 Published by Elsevier B.V.