Authors:
K. L. G. V. Araújo Programa de Pós-Graduação em Ciência e Tecnologia de Alimentos, CT, Universidade Federal da Paraíba, Campus I, João Pessoa, Paraíba, 58051-970, Brazil

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P. S. Epaminondas Programa de Pós-Graduação em Ciência e Tecnologia de Alimentos, CT, Universidade Federal da Paraíba, Campus I, João Pessoa, Paraíba, 58051-970, Brazil

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M. C. D. Silva Centro de Ciências Sociais, Saúde e Tecnologia, Universidade Federal do Maranhão, Campus II, Imperatriz, Maranhão, 65901-000, Brazil

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A. E. A. de Lima Laboratório de Combustíveis e Materiais—LACOM, Departamento de Química, CCEN, Universidade Federal da Paraíba, Campus I, João Pessoa, Paraíba, 58059-900, Brazil

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R. Rosenhaim Laboratório de Combustíveis e Materiais—LACOM, Departamento de Química, CCEN, Universidade Federal da Paraíba, Campus I, João Pessoa, Paraíba, 58059-900, Brazil

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A. S. Maia Laboratório de Combustíveis e Materiais—LACOM, Departamento de Química, CCEN, Universidade Federal da Paraíba, Campus I, João Pessoa, Paraíba, 58059-900, Brazil

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L. E. B. Soledade Laboratório de Combustíveis e Materiais—LACOM, Departamento de Química, CCEN, Universidade Federal da Paraíba, Campus I, João Pessoa, Paraíba, 58059-900, Brazil

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A. L. Souza Laboratório de Combustíveis e Materiais—LACOM, Departamento de Química, CCEN, Universidade Federal da Paraíba, Campus I, João Pessoa, Paraíba, 58059-900, Brazil

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I. M. G. Santos Laboratório de Combustíveis e Materiais—LACOM, Departamento de Química, CCEN, Universidade Federal da Paraíba, Campus I, João Pessoa, Paraíba, 58059-900, Brazil

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A. G. Souza Laboratório de Combustíveis e Materiais—LACOM, Departamento de Química, CCEN, Universidade Federal da Paraíba, Campus I, João Pessoa, Paraíba, 58059-900, Brazil

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N. Queiroz Laboratório de Combustíveis e Materiais—LACOM, Departamento de Química, CCEN, Universidade Federal da Paraíba, Campus I, João Pessoa, Paraíba, 58059-900, Brazil

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Abstract

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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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
1
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)