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Effects of modified atmosphere and vacuum on the shelf life of tilapia (Oreochromis niloticus) fillets.

Author(s) : SOCCOL M. C. H., OETTERER M., GALLO C. R., et al.

Type of article: Article

Summary

The objective of this work was to develop a convenience product, minimally processed tilapia, by determining its shelf life from the monitoring of its chemical properties, as well as performing sensory and microbiological evaluations. With this intent, aquacultured Nile tilapia (Oreochromis niloticus) raised on farms located in the Jau region, São Paulo State, Brazil, was depurated, gutted, filleted, packed in polystyrene trays and covered with EVOH (copolymer of ethylene of vinyl alcohol film) (control). Some of the fish were chemically treated by immersion in 1% acetic acid and packed under a 60% CO2/40% O2 modified atmosphere (MAP) and vacuum packing and some of the fish were just packed under 60% CO2/40% O2 MAP and vacuum packing. The packaged samples were analyzed at the beginning of the experiment and after 7, 13 and 20 days of refrigerated storage at around 1 plus or minus 1°C. No significant differences amongst the treatments were found for non-protein nitrogen, total volatile base nitrogen or pH. The use of MAP, whether associated with acetic acid or not, promoted greater amounts of thiobarbituric acid reactive substances - TBARS. Moreover, rancidity was detected in the sensory analysis of the MAP fillets. The fillets treated with acetic acid + EVOH, MAP and MAP associated with acetic acid were discoloured and presented a softer texture, when compared to the non-treated ones. Salmonella, sulfite-reducing Clostridium and E. coli were not detected during the storage period. MAP and vacuum packing, associated with acetic acid inhibited the development of S. aureus, total coliforms and psychrotrophic bacteria, lengthening the shelf life by 20 days. Vacuum packing associated with acetic acid was the treatment that promoted the best chemical, microbiological and sensory stability up to the end of the experiment.

Details

  • Original title: Effects of modified atmosphere and vacuum on the shelf life of tilapia (Oreochromis niloticus) fillets.
  • Record ID : 2008-0747
  • Languages: English
  • Source: Braz. J. Food Technol. - vol. 8 - n. 1 (181)
  • Publication date: 2005/01

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