Abstract
Quality and safety of turbot fillets under modified atmosphere packaging (MAP) were assessed by microbial (total viable counts), physical (drip loss, pH, colour CIE Lab) and chemical parameters (total volatile basic nitrogen (TVBN), trimethylamine nitrogen (TMAN), biogenic amine contents). Three different atmospheres (MAP 1, 10/40/50 % O2/CO2/N2; MAP 2, 10/60/30 % O2/CO2/N2; MAP 3, 10/80/10 % O2/CO2/N2) were tested. Packaged turbot fillets were stored at 2 ± 1 °C and monitored over 30 days, at intervals of 5 days. Fillets from the control group, packaged with air (AIR), were the first to present signs of degradation reaching rejection threshold values for all evaluated parameters. In MAP fillets, total bacterial count was lower than 106 cfu/g for a longer period. After 10 days of storage, MAP and AIR fillets showed significant differences (p < 0.05) on the values of TVBN, TMAN and biogenic amines. MAP fillets presented a higher drip loss, and fillets in AIR became more yellowish (upper b* values) while those in MAP looked whitish for an increased period (upper L* values). All microbial, chemical and physical traits revealed the protective effect of the different MAP studied, especially those with a higher percentage of CO2. MAP application added, at least, 5 days to shelf life of turbot fillets.
Published Version
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