Journal of Thermal Analysis and Calorimetry

, Volume 106, Issue 2, pp 557–561

Influence of thermal degradation in the physicochemical properties of fish oil

  • K. L. G. V. Araújo
  • P. S. Epaminondas
  • M. C. D. Silva
  • A. E. A. de Lima
  • R. Rosenhaim
  • A. S. Maia
  • L. E. B. Soledade
  • A. L. Souza
  • I. M. G. Santos
  • A. G. Souza
  • N. Queiroz
Article

DOI: 10.1007/s10973-011-1409-9

Cite this article as:
Araújo, K.L.G.V., Epaminondas, P.S., Silva, M.C.D. et al. J Therm Anal Calorim (2011) 106: 557. doi:10.1007/s10973-011-1409-9

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.

Keywords

Sea fish oilOmega3-thermal oxidationThermal analysis

Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2011

Authors and Affiliations

  • K. L. G. V. Araújo
    • 1
  • P. S. Epaminondas
    • 1
  • M. C. D. Silva
    • 2
  • A. E. A. de Lima
    • 3
  • R. Rosenhaim
    • 3
  • A. S. Maia
    • 3
  • L. E. B. Soledade
    • 3
  • A. L. Souza
    • 3
  • I. M. G. Santos
    • 3
  • A. G. Souza
    • 3
  • N. Queiroz
    • 3
  1. 1.Programa de Pós-Graduação em Ciência e Tecnologia de Alimentos, CTUniversidade Federal da ParaíbaJoão PessoaBrazil
  2. 2.Centro de Ciências Sociais, Saúde e TecnologiaUniversidade Federal do MaranhãoImperatrizBrazil
  3. 3.Laboratório de Combustíveis e Materiais—LACOM, Departamento de QuímicaCCEN, Universidade Federal da ParaíbaJoão PessoaBrazil