Effects of modified atmosphere and vacuum packaging on microbiological and chemical properties of rainbow trout (Oncorynchus mykiss) fillets.
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 degrees C were determined. The gas mixtures evaluated were 100% CO2, 2.5% O2+7.5% N2+90% CO2 and 30% O2+30% N2+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% O2. 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.
Arashisar
Sükriye
S
Agricultural Faculty Fisheries Department, Atatürk University, Erzurum 25240, Turkey.
Hisar
Olcay
O
Kaya
Mükerrem
M
Yanik
Telat
T
D000818:Animals; D001420:Bacteria, Aerobic / Q000254:growth & development / Q000302:isolation & purification*; D002245:Carbon Dioxide / Q000494:pharmacology; D015169:Colony Count, Microbial; D004755:Enterobacteriaceae / Q000254:growth & development / Q000302:isolation & purification*; D005516:Food Microbiology; D018857:Food Packaging / Q000379:methods*; D015227:Lipid Peroxidation; D017686:Oncorhynchus mykiss / Q000382:microbiology*; D011786:Quality Control; D017747:Seafood / Q000032:analysis* / Q000382:microbiology*; D017392:Thiobarbituric Acid Reactive Substances / Q000032:analysis; D014618:Vacuum
D017392:Thiobarbituric Acid Reactive Substances; D002245:Carbon Dioxide