Comparison of Stunning Methods on the Physicochemical Properties of Frozen Nile Tilapia (Oreochromis niloticus) Fillets |
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| Authors: | Paulo Roberto Campagnoli de Oliveira Filho Paulo José do Amaral Sobral Julio César de Carvalho Balieiro |
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| Institution: | 1. Laboratório de Tecnologia do Pescado, Departamento de Pesca e Aquicultura, Universidade Federal Rural de Pernambuco (UFRPE), Rua Dom Manuel de Medeiros, Recife, PE, Brasil;2. Laboratório de Tecnologia de Alimentos, Departamento de Engenharia de Alimentos, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de S?o Paulo (FZEA-USP), Pirassununga, SP, Brasil;3. Faculdade de Medicina Veterinária e Zootecnia, Universidade de S?o Paulo (FMVZ-USP), Pirassununga, SP, Brasil |
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| Abstract: | This study compares how CO2 narcosis and thermal shock affect the physicochemical aspects of Nile tilapia fillets held frozen (?18°C) for up to 6 months. The characteristics of tilapia fillets subjected to CO2 narcosis were those of higher lightness and whiteness and lower redness. The hardness values of fillets of tilapia subjected to thermal shock were lower than those subjected to CO2 narcosis. During frozen storage to both treatments, the drip loss, denaturation of myosin, and lipid oxidation increased, while fillet water holding capacity and hardness decreased. The physicochemical properties of frozen fillets of tilapia stunned by CO2 narcosis were considered more desirable; therefore, the method can be a potential replacement to thermal shock. |
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| Keywords: | Oreochromis niloticus stunning stability freezing fish fillet quality |
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