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Chitosan Extends the Shelf-life of Filleted Tilapia （Oreochromis niloticus） During Refrigerated Storage
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Chitosan Extends the Shelf-life of Filleted Tilapia （Oreochromis niloticus） During Refrigerated Storage
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Chitosan Extends the Shelf-life of Filleted Tilapia （Oreochromis niloticus） During Refrigerated Storage
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Journal Article
Chitosan Extends the Shelf-life of Filleted Tilapia （Oreochromis niloticus） During Refrigerated Storage
2012
Overview
Shelf-life extension of aquatic products is of significant economical importance. To determine the potential effect of chitosan on the shelf-life of filleted tilapia, this study analyzed the bacterial community diversity in fresh and spoiled tilapia fillets stored at （4 ± 1）℃ and examined the antimicrobial activity of chitosan against relevant bacteria isolates. Results showed that Pseudomonas （20%） and Aeromonas （16%） were abundant in fresh tilapia fillets, whereas Pseudomonas （52%）, Aeromonas （32%） and Staphylococcus （12%） were dominant in the spoiled samples. Chitosan showed wide-spectrum antibacterial activity against bacteria isolated from tilapia and 5.0 g L-1 chitosan was selected for application in preservation. We further determined the shelf-life of chitosan-treated, filleted tilapia stored at （4 ± 1）℃ based on microbiological, biochemical and sensory analyses. Results showed that the shelf-life of chitosan-treated, filleted tilapia was extended to 12 d, whereas that of untreated, control samples was 6 d. These indicate that chitosan, as a natural preservative, has great application potential in the shelf-life extension of tilapia fillets.
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