Influence of thermal degradation in the physicochemical properties of fish oil
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Physicochemical and thermal analyses were undertaken to evaluate the influence of the temperature on the oxidation of sea fish oil once its polyunsaturated fatty acids deteriorate rapidly. Fish oil displayed four decomposition steps in synthetic air atmosphere and only one step in nitrogen atmosphere. The first step started at 189 and 222 °C for oxidizing and inert atmospheres, respectively. An OIT value of 53 min was measured at 100 °C. After the degradation process the peroxide index and the iodine index reduced from 35.38 to 9.85 meq × 1000 g−1 and from 139.79 to 120.19 gI2 × 100 g−1, respectively. An increase of the free fatty acids amount from 0.07 to 0.17% was observed while viscosity increased from 57.2 to 58.0 cP. Absorption at 272 nm also increased. The thermogravimetric and spectroscopic techniques are reproducible and versatile being an option for characterization of edible oil oxidation.
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- Influence of thermal degradation in the physicochemical properties of fish oil
Journal of Thermal Analysis and Calorimetry
Volume 106, Issue 2 , pp 557-561
- Cover Date
- Print ISSN
- Online ISSN
- Springer Netherlands
- Additional Links
- Sea fish oil
- Omega3-thermal oxidation
- Thermal analysis
- Industry Sectors
- Author Affiliations
- 1. Programa de Pós-Graduação em Ciência e Tecnologia de Alimentos, CT, Universidade Federal da Paraíba, Campus I, João Pessoa, Paraíba, 58051-970, Brazil
- 2. Centro de Ciências Sociais, Saúde e Tecnologia, Universidade Federal do Maranhão, Campus II, Imperatriz, Maranhão, 65901-000, Brazil
- 3. Laboratório de Combustíveis e Materiais—LACOM, Departamento de Química, CCEN, Universidade Federal da Paraíba, Campus I, João Pessoa, Paraíba, 58059-900, Brazil